MODIFIED SPECIFICATIONS

1. COMPETING MODELS
Modified Division races are open to eligible 1983 through 2003 models of American-made steel bodied passenger car production sedans. Unless otherwise authorized by TIOGA track, all combination events shall be governed by these specifications.

Approved Competition Models
BUICK Skyhawk
CHEVROLET Cavalier, Monte Carlo
DODGE Avenger, Stealth
FORD Escort
MERCURY Mercury
OLDSMOBILE Firenza
PLYMOUTH Laser, Sundance
PONTIAC Sunbird, J-2000, Grand Prix

2. FRAMES AND CAGES
All frames must meet the requirements described in the following paragraphs. No aluminum or light alloy frames are permitted. All frames are subject to officials approval. All frame components must be made of steel and welded. Side frame rails and rear kick up must be constructed of .120 inch minimum thickness, and be a minimum of two (2) inches wide and three (3) inches high steel box tubing.

One (1) fuel cell protector bar, using a minimum 1-1/2 inches seamless steel tubing, must be installed behind the fuel cell. This protective bar must be as wide as the fuel cell and as low to the ground as the fuel cell with a minimum of two (2) uprights from the protective bar to the rear frame cross-member, evenly spaced behind the fuel cell. An additional X cross-member made of one (1) inch steel tubing must be installed beneath the fuel cell from corner to corner. The X cross-member must be welded or bolted to the rear frame in a secure manner. Two (2) additional support bars, one (1) at each corner of the protective bar, must extend forward and be welded to the rear from assembly. Cars built prior to the implementation of the 18-degree rear frame kick up and 30-degree front frame kick up rule will be allowed to compete. In order to increase the driver compartment are, the left side frame rail and roll cage may be moved out a maximum of two (2) inches, this applies to all cars constructed from 1989 and later.

3. OVERALL CAR WEIGHT
All specified minimum car weight requirements will be with gas, oil and water (with driver). Minimum weight requirement of 2,610 pounds and a maximum weight requirement of 3,200 pounds will be required in this division regardless of the cubic inch displacement. No care will be allowed to have more than 55% total weight as left side weight. 100 lbs weight deduction for any car running the steel head engine rule.

SMALL BLOCKS - A minimum weight requirement of 6.8 lbs per cubic inch plus 175 lbs for the driver. CORRECT CUBIC INCH AND TOTAL WEIGHT MUST BE CLEARLY DISPLAYED ON HOOD OF CAR. NOTE ALL CARS NOT CONFORMING TO 12 TO 1 COMPRESSION RULES MUST WEIGH AND ADDITIONAL 8.5 LBS PER EACH 1/10 LBS OF COMPRESSION IN EXCESS OF 12 TO 1 COMPRESSION.

ADDED CAR WEIGHT - Added weight must be securely bolted to the frame rail. Dislodged weight cannot be returned to the car for weighing after the race. No added weight will be permitted inside the driver's compartment. Weight must be painted white with car numbers stenciled in black. No pellets style weight allowed. When cars are scaled for weight after a race, wheels and tires cannot be changed, nothing (fuel, fluids of any type) can be added to the car.

4. DETAILED BODY REQUIREMENTS
In addition to the General Body Requirements, specified above, the following Detailed Body Requirements shall be observed. Additions to car bodies, such as fins, wings, scoops, signs, etc., will not be permitted.

FRONT AIR DAM - An approved air dam may be mounted to the front underside of the cars. The optional metal or vinyl front air dam must be mounted perpendicular to the ground and no more than three (3) inches behind the front of the nose panel. Front nose panel and air dam must not extend past the rear edge of the front bumper and must maintain two (2) inches ground clearance. Nose panel and front air dam must not extend past outside edge of front frame rails. Air dams must have a minimum ground clearance of two (2) inches. All support brackets must be mounted to the rear of the air dam. NO HORIZONTAL OR FLAT AIR DEFLECTORS MAY EXTEND PAST THE OUTER EDGES OF THE FRONT NOSE PANEL SIDEWALLS.

REAR SPOILERS - An approved spoiler must be a nonadjustable part of the body, which controls the flow of air over one (1) surface only. An approved spoiler must have a minimum thickness of 0.125 inches. All rear spoilers and spoiler mounting points must be approved by the officials. A solid rear spoiler of clear Lexan glass only, may be installed at the rear of the deck lid and must meet the requirements that follow: A maximum spoiler size permitted shall be eight (8) inches high by 48 inches wide. The rear spoiler must not be wider than the standard width of the quarter panels, measured across the top and shall not extend rearward past the trailing edge of the rear bumper. A maximum of two (2) one (1) inch wide adjustable supports is permitted on the front of the spoiler. A maximum of three (3) supports may be attached to the rear of the spoiler. The supports, front or rear, may be attached to the spoiler using a piece of one (1) by one (1) inch aluminum angle one (1) inch long. A maximum of 35 inches measured from the ground to the spoiler mounting point is permitted.

WHEELBASE - A minimum wheelbase of 107 inches is required.

WINDSHIELD - A Lexan windshield must be used on the driver's side with a complete windshield screen on the right side. The windshield may be installed using two (2) pieces of Lexan glass. The top portion must extend across in front of the driver. The bottom portion must extend from the top of the dash or cowl upward behind the top portion in the front of the driver. The screen can be omitted if a full windshield is used. No decals permitted on windshield.

SIDE WINDOW GLASS - All side window glass must be removed. A nylon window net must be installed in the left side door glass opening. The window net must be made form 3/4 inch wide nylon material with a minimum 1 inch square opening between the ribs. The minimum window net size shall be 22 inches by 16 inches high. All window net mounts must be welded to the roll cage. Window net must be secure with a quick release type latch, and must fall downward when opened. Minimum side window openings on all models shall be 13 1/2 inches when measured from the top of the door to the bottom of the roof drip rail or the roof roll bar (which ever is closest).

FIREWALL - Front and rear firewall of not less than 22 gauge steel must separate the driver from the engine and fuel cell. Front firewall must be positioned below the leading edge of the windshield. The firewall must be sealed and free of holes.

DOORS - All door panels must be made of steel. Any seams, creases, or accent lines fabricated in the door shall be parallel with the top of the door. A minimum of 72 inches up to a maximum of 78 inches is permitted when measured from the center of the rear axle housing forward to the front of the door. A maximum distance of 55 1/2 inches permitted when measured across the car at the front outside edge of the door panel.

QUARTER PANELS - Panels must be made of steel. A minimum distance of 36 inches and a maximum of 42 inches measured form the center of the rear axle to the rear of the body is permitted. A maximum distance of 60 inches is permitted between the top of the rocker panels measured across the body at the rear axle housing. The maximum height of the rear quarter panels measured from the ground to the rear of the quarter panel will be 35 inches. The rear quarter panels must maintain a minimum of 8 inches ground clearance behind the rear wheels. A maximum of 60 inches is permitted when measured across the top at the rear of the quarter panels. A maximum of 4 degrees of rake from stock dimension will be permitted in the body, measured anywhere along the quarter panels and doors.

GRILLS - The air intake housing must maintain a rectangular shape across the front nose. Only screens will be permitted in the opening to allow for proper cooling. No fiberglass air intake housings.

HOODS/ROOFS - Positive hood fasteners must be used on both sides, front and rear. If sides are used, minimum ground clearance of 2 inches is required. Hood must cover cowl and top part of radiator with openings only for the air cleaner and distributor. Roof must remain stock for model of body used. Roof support post must maintain the same angles as a stock production car. The front (a post) must be mounted to the tope of the door panel. The rear post must be anchored to the quarter panels.

REAR DECK LID - Rear deck lid must be made steel.

TAILLIGHT PANEL - All cars must be equipped with a solid taillight panel. The taillight panel must extend down to the top of the frame rail and have a maximum 1 1/2 inch lip on the bottom edge.

REAR VIEW MIRROR/RADIOS - Rear view mirror (maximum size 2 1/8 inches by 17 3/4 inches). Rear view mirror shall not extend outside of the car. Radio frequencies must be registered with the track.

BUMPERS AND SIDE RAILS - The bumpers and side rails must meet the following requirements: Front bumper must be made of two pieces of 1 1/2 inches minimum 1 3/4 inches maximum tubing four (4) to six (6) inches apart, center to center, mounted to the front frame rails, spindle height, with a minimum of four (4) vertical connectors. Two (2) connectors have to be welded in the center of the radius corners with the remaining two (2) spaced between the corner uprights. Front bumper must be convex in shape with rounded corners, and mounted to the outside ease on the front frame rails, but no wider. The maximum distance from the center of the front spindle to the front of the front bumper can be no more than 30 inches. Rear bumpers must be made from an "I" beam extruded from aluminum. The minimum width, when measured across the rear of the car will be 57 inches and the maximum width permitted will be 66 inches. Each end of the bumper (from the mounting side) must be cut on an angle and capped with a minimum of 0.125 inch aluminum. All bumper caps must be welded and sharp edges MUST be filed. The minimum size permitted will be 2 3/4 inches by four (4) inches by 3/16 inch thick. Bumpers must be mounted at axle height. A maximum distance of 46 inches measured at the center of the rear axle to the rear edge of the bumper is permitted. No weight reducing holes permitted in bumper. Any inappropriate bumper will be disallowed. no side rail or bumper will be allowed with ballast inside it.

All cars must be equipped with rear corner and side rails. All rails must be constructed using minimum .083 inch thick steel seamless tubing with an outside diameter of minimum 1 1/4 inches and maximum 1 3/4 inches. Right sidebars shall be constructed using 2 pieces of steel seamless tubing. The bottom bar shall attach to the rear of the frame rail and extend upward and outward even with the outside of the tires. The bottom sidebar shall extend forward parallel with the frame rail and angle into the sub frame rail with minimal tire clearance. The bottom bar shall be mounted centerline with the real axle and front spindle. The top side bar shall be attached centerline with the rear hoop cross bar extending outward and forward to the forward most point of the bottom bar. An additional support must be attached to the frame rail and side bar. Two additional vertical support bars should be added, 1 at the rear and 1 in the center of the side rail bar.

Left side bars will be constructed using the same guidelines as described above except that the rear support bar may be a radiuses bar that attaches to the rear hoop bar centered on the cross bar and extending down and attached to the frame rail. No car will be permitted in competition without side rails. Side rail bars may extend up to 2" beyond the outside of the tire.

Rear corner rails must be constructed using 2 pieces of steel seamless tubing a minimum of 1 1/4 inches and a maximum of 1 3/4 in diameter. Both pieces of tubing shall be identically formed and welded to a steel bumper bracket at the rear. The tubing shall angle out and upward even with the outside of the rear tires. The corner bumpers shall then turn in with minimal tire clearance to the rear quarter panels. Additional support bars must be installed behind the body panels to the rear frame rails and/or roll cage.

5. SUSPENSION

COIL SPRINGS - Coil over front springs allowed. Coil overs must mount to lower control arms. Strut bars will not be permitted for mounting of coil overs. Rear springs positions may be changed, but both rear springs must be located either inside or outside of frames rails.

SWAY BARS - Only steel front sway bars (anti-roll bars) are permitted. No rear sway bars (anti-roll bars) will be permitted.

SHOCK ABSORBERS - A maximum of one (1) shock per wheel. No remote adjustable suspension controls or devises within reach of driver.

TREAD WIDTH - A ;maximum of 84 inches is permitted to be measured from outer side wall to outer side wall of tires.

SPINDLES - Only steel spindles permitted. No aluminum spindles will be allowed. Must utilize tether assembly between spindle and frame.

A-FRAMES - The upper A-frame and lower control arms must meet the following requirements: Upper A-frames and lower control arms must be approved by officials. When attaching upper control arms the mounting plate, only standard type castor-camber shims or washers will be permitted.

6. BODY HEIGHT REQUIREMENTS

BODY HEIGHT REQUIREMENTS - The car bodies must be neat appearing. All bodies must be installed on the frame in a manner acceptable to officials. Window openings must remain stock appearing and must maintain the original manufacturer's window opening configuration. No car will be allowed to compete with altered window openings. Bodies must be no wider than standard width from the front of the windshield opening to rear of the car. Bodies must be no wider than the standard width from the front of the door panel to the rear of the quarter panels when measured beneath the car at the rocker panels. A minimum distance of 43 inches and a maximum of 45 inches is permitted across the body at the bottom of the front windshield opening. Bodies must not extend below the frame at the side rails. No skirts or additional metal may extend below the body. Floor must be complete in the driver compartment under the seat, forward to the front engine firewall, must be a minimum of 1/8 inch thick steel. No car will be allowed to compete without a minimum of 1/8 inch thick steel floor in the driver's compartment. No streamlining at the top of the windshield. Bodies must have standard appearing windshield opening and windshield post must follow standard configuration. No car will be allowed to compete with excessive body damage (EXCESSIVE BODY DAMAGE TO BE DETERMINED BY OFFICIALS). No belly pans. A belly pan will be defined as any object or material that alters the flow of air under the car. Determination of whether any material or object is or is not a belly pan shall be in the discretion of the officials. Bottom panel of the front nose panel may not extend rearward past the front edge of the harmonic balance. The drivers compartment may be enclosed with additional sheet metal. All interior sheet metal must be a minimum of 22 gauge welded steel. No interior sheet metal can be higher than or enclose a standard window opening. Sheet metal in driver's compartment must be horizontal form the top of the drive shaft tunnel to the right side door bars. Angled or horizontal metal must extend form the rear firewall or back of seat a minimum of 26 inches forward. The interior sheet metal behind the rear hoop may be rolled upward to the top of the rear hoop cross bar. No interior spoilers, wings or wind deflectors allowed. No double panels. All interior sheet metal subject to officials approval.

WEIGHT SHIFTING DEVICES - No mechanical or electrical devices for shifting weight will be permitted within drivers reach. No hydraulic weight shifting devices permitted at any time. No adjustable panhard bar from inside the race car (not within drivers compartment or reach).

7. IDENTIFICATION AND MARKINGS

NUMBERS

A. All car number configuration and design is subject to approval by track officials. Size, color, and style of numbers must be adequate to permit prompt identification by track officials at all times. Numbers at least 18 inches high, excluding borders and silhouettes, must be neatly attached to or painted on both sides of the car on the center of the door. Door numbers must be a minimum of four (4) inches in width and slant no more than 30 degrees from vertical. The tops and bottoms of all numbers must be even (not staggered) two digit numbers must not overlap. A number 18 inches high excluding borders and silhouettes, must be neatly attached to or painted on the roof, reading from the passenger side. Block type numbers, as large as possible must be attached to or painted on the right outer nose and taillight covers. The use of number decals is acceptable if track officials determine that the number is legible.

B. All car numbers need to be registered with handicapper, Lyndell at 607-625-9957.

C. In any division, track officials may require a competitor to use a different number or letter in order to avoid duplication or

confusion at an event.

DECALS AND ADVERTISING

A. TIOGA officials my refuse to permit, or it may restrict or assign the size or placement of decals, identification, and advertising of any kind on a car for any reason. All TIOGA track members agree to accept track decision in this regard.

B. TIOGA officials may refuse to permit a competitor to participate in an event if track officials determines that any advertising, sponsorship or similar agreement to which the competitor (or a car owner, driver or crew member related to the competitor) is or will be a party to, is detrimental to the sport for any reason, including without limitation the public image of the sport.

C. All decals or adhesive-backed emblems supplied by manufacturers for advertising or identification on the race cars are limited in size to the area of a 32 square inch decal. Decal sizes will be determined by multiplying the full width and full length of any decal, regardless of the decal shape.

D. decals, advertising logos, text or identification may not be placed on the front of each door and/or each side of the hood (between the front of the car and the front of the door) other than:
1. decals, advertising logos, text or identification of race sponsors
2. decals, advertising logos, text or identification of track contingency program sponsors, or
3. such other decals, advertising or identification as TIOGA officials may in its sold discretion permit or require

E. Decals, advertising logos, text or identification of sponsors will not be permitted on the windshield or rear spoiler.

F. Advertising, other than the car number, will not be permitted on the door of the car from the front of the door to the front edge of the "b" post.

8. GENERAL ENGINE REQUIREMENTS

GENERAL ENGINE ELIGIBILITY: The eligible engines will be production engines as determined, selected, and approved by the officials. It is mandatory that all engine blocks be produced by manufacturer for sale to the public in a regular product offering. All major engine component parts must be approved by the officials to be eligible for competition.

No changes from approved standard production automobiles or component parts will be permitted except as specified in the following rules for engine preparation. In addition to the General Engine Requirements specified in the above paragraphs, the following Detailed Engine Requirements shall be observed.

ENGINE LOCATION - The engine location must be approved by the officials. The engine must be mounted between the frame rails in front of the driver. The centerline of the crankshaft when measured to the center of the lower ball joint, left and right must be within two (2) inches in distance. The engine may not be tilted. All engine mounts must be securely bolted. Engine mounts must be reinforced..

ENGINE DISPLACEMENT - Only "small block" V8 engines. To clarify the identification of a "small block" engine, listed below are the basic engine designated and approved as "small block" engines. Any engine not listed will be designated as a "large block" engine and will not be permitted, regardless of engine size.

CHEVROLET FORD CHRYSLER
307 CID 302CID 318CID
327CID 351CID 340CID
350CID 360CID

Engine displacement may be increased by boring or stroking. Formula for determining cubic inch engine displacement of each cylinder added together will determine the total cubic inches displacement of the engine.

ELIGIBILITY - All engine blocks must be product of the manufacture of the make and model car being used in competition. No after-Market engine blocks permitted. The engine block must retain all standard external dimensions with the exception of the maximum allowable overbore and surfacing of the block deck. No angle cutting of the block deck is permitted. No aluminum blocks permitted.

INTERNAL CHANGES - Any aluminum piston may be used. Only steel connecting rods are permitted. Titanium, aluminum, and stainless steel connecting rods are not eligible for use.

OIL PANS - The oil pan must be made of steel. Engine oil coolers may be either an oil to air or oil to water heat exchanger mounted adjacent to the engine. The oil cooler intake mounted above the interior sheet metal can be no longer than 5 inches in height and 10 inches in width.

CYLINDER HEADS - Cylinder heads must meet the following requirements. Only steel or titanium valves are permitted. Only steel valve springs are permitted. Limit of two (2) valves per cylinder. No SB2 cylinder heads are permitted. No valve size restriction.

CRANKSHAFT, VALVE LIFTERS AND ROCKER ARM

CAMSHAFT - Any steel cam shaft may be used; roller camshaft permitted. Camshaft may be gear driven, chain, or belt driven.

VALVE LIFTERS - Solid steel or steel hydraulic valve lifters are optional. Roller tappets, mushroom valve lifters and any type of mechanical assistance exerting a force to assist in closing the lifter and/or push rod, common known, as rev-kits will be permitted.

ROCKER ARMS - Any rocker arm that is standard on the approved engine being used and roller bearing rocker bearing rocker arms acceptable to officials may be used. Split shaft rocker arm assemblies permitted. Valve covers must be made of metal.

12 TO 1 STEEL 358 C.I. ENGINE MAXIMUM

Minimum weight ported 2575 lbs, un-ported 2510 lbs, maximum left side weight 55%.

ENGINE BLOCKS - All engine blocks must meet the requirements that follow.

ELIGIBILITY
All engine blocks must be a product of the manufacturer of the engine being used in competition. Aftermarket engine blocks will not be permitted. The engine block must retain all standard external dimensions with the exception of the maximum allowable overbore of 0.060 and the surfacing of the block deck. Angle cutting of the block deck will not be permitted.

Aluminum blocks will not be permitted. The General Motors cast iron blocks, part numbers 22551657, 22551659, 22551788 and 22551790, are not permitted.

INTERNAL CHANGES - Internal polishing of the engine block is permitted.

PISTONS/RODS - Any round aluminum flat top or dish piston may be used. Pistons must run three ring grooves. All three rings

must be used. No gas porting. Maximum overbore 0.060. Only solid magnetic steel connecting rods permitted. (6) inch length maximum. Titanium and stainless steel connecting rods are not approved for use.

CRANKSHAFT
A. Only magnetic steel crankshafts are permitted. Stock stroke crankshaft will be +/-.010 from factory listed stroke.

B. Aftermarket crankshafts must be designed and manufactured the same as an OEM type crankshaft.

C. No polishing or knife edging allowed. No drilling or lighting of main journals.

D. No hollowed out or sculpturing of counter weights.

E. Pin holes may be drilled for balancing only, but no cutting or turning down of counter weights.

F. All balancing holes must be perpendicular to crankshaft centerline.

CAMSHAFT, VALVE LIFTERS, AND ROCKER ARMS

CAMSHAFT - Any magnetic steel camshaft may be used; roller camshaft permitted. Camshaft may not be gear driven or belt driven. Camshafts must be driven in the same direction of rotation as the track approved standard production engine.

VALVE LIFTERS - Solid magnetic steel or magnetic steel hydraulic valve lifters are permitted. Roller tappets, mushroom valve lifters and any type of mechanical assistance exerting a force to assist in closing the lifter and/or push rod, commonly known as rev-kits will be permitted. The standard production design push rod guide plates will be the only guides permitted. Only magnetic steel valve push rods are permitted.

ROCKER ARMS - Any rocker arm that is standard on the approved engine being used and roller bearing rocker arms acceptable to Track Officials may be used. Split shaft rocker arm assemblies permitted. Machining of head for shaft rocker assembles permitted.

Valve covers must be made of metal.

Stud girdles allowed.

OIL PANS AND OIL COOLERS - The oil pans and oil coolers must meet the requirements that follow.

A. Oil pans must be made of magnetic steel and must be approved by Track Officials.

B. Engine oil coolers may be either an oil to air or an oil to water heat exchanger mounted adjacent to the engine. The oil cooler air intake mounted above the interior sheet metal can be no larger than five (5) inches in height and 10 inches in width. Outside edges of the oil cooler must be completely sealed with sheet metal. All oil coolers and their installation must be acceptable to Track Officials.

CYLINDER HEAD - All cylinder heads must be Tioga approved and all modification must be submitted to Tioga before any proposed modification will be eligible for approval. Tioga Track Officials may use a cylinder heads provided by the respective manufacturer as a guide in determining whether a competitor's cylinder head conforms to the specifications of the rule book. Approved manufacturers' identification in the form of cast-in part numbers must remain unaltered on the he cylinder heads being used in competition.

HEAD CASTINGS - Only permitted cast iron head numbers, Chevrolet # 10134392, 1411058, casting # 1411034, (2.050 INT-1.600 EXH) Ford # M-6049-N351 (2.020 INT-1.600 EXH) Mopar # W-2 (2.020 INT-1.625 EXH) E.41.9.11. With the exception of milling of deck and intake surface, head must meet O.E.M. external and internal specifications and dimensions and must maintain stock valve centerline and valve guide angle. WILL BE CHECKED.

VALVES - Stainless steel valves only. Stock valve stem diameter, NO titanium valves.

INTERNAL CHANGES - Internal changes for the O.E.M. cylinder heads are as follow:

A. Airflow improvements by internally polishing and porting are permitted.

B. Improvements or modifications to the cylinder head may be done by removing material form the production casting.

C. Additions of foreign material (i.e. epoxy, plastics, welding, etc.) to the production casting is not permitted.

Except as provided below, internal polishing and porting will be permitted. The original shape and configuration of the port must not be notched, grooved, channeled, or ridged in any way. Among other things, after polishing or porting the intake port walls, port roof and port floor over one (1) surface each except where the manufacturer has cast a valve guide support into the roof of the intake port.

INTAKE MANIFOLD - Eligibility Requirements

A. Must be approved by Tioga Officials. Only aluminum intake manifolds permitted. Approved manufacturer's identification in the form of cast-in part numbers must remain unaltered on the manifold.

B. Only open plenum one piece intake manifolds permitted. The plenum opening cannot be reduced in size at any point. The plenum opening shall maintain the same shape and configuration as an open hole four (4) barrel carburetor gasket. The inside floor of the plenum must remain in the stock location and be the same shape as compared to the approved manifold with the same part number.

C. Only one (1) standard flat gasket, a maximum thickness of 0.117 inch, may be used between the cylinder head and the intake manifold.

MODIFICATIONS NOT ALLOWED
A. Polishing or enlarging of port holes in intake manifold is not permitted. Epoxy or filler will not be permitted inside the intake manifold.

B. The length of the intake manifold runners may not be changed.

C, External modifications to the runners or flange will not be permitted.

D. Spacers may not be added to the runners.

E. Internal modifications to the intake manifold runners or plenum will not be permitted.

F. Intake manifolds which have been painted or coated will not be permitted.

G. Air holes may not be opened in the he intake manifold.

H. Spacers between the engine block and intake manifold and cylinder heads will not be permitted.

I. Added directional devices will not be permitted inside the plenum of the intake manifold.

J. External modifications will not permitted. No homemade manifolds. No tunnel rams allowed.

INTAKE MANIFOLD - Only aluminum intake manifolds are permitted. Only open plenum intake manifolds permitted. Sheet metal manifolds not permitted. Intake only: internal manifold modifications below the carburetor base are permitted after purchase from the finished parts suppliers. Approved manufacturer's identification in the form of cast-in part numbers must remain unaltered on the manifold. Only open plenum intake manifolds permitted within a minimum opening 3-5/8 inches in width by 3-9/16 inches in length. The plenum opening cannot be reduced in size at any point. The plenum opening shall maintain the same shape and configuration as an open hole four (4) barrel carburetor gasket. The inside floor of the plenum must remain in the stock location and be the same shape as compared to the approved manifold with the same part number.

MODIFICATIONS ALLOWED - Polishing or enlarging or portholes in intake manifold is permissible. Epoxy or filler will not be permitted inside the intake manifold.

MODIFICATIONS NOT ALLOWED - No air holes may be opened in the intake manifold. No spacers allowed between engine block and intake manifold or between intake manifold and cylinder heads. No added air directional devices will be permitted inside the plenum of the intake manifold. No external modifications permitted. No painting of intake manifolds permitted. All identification numbers must be left on. The length of the intake manifold runners may not be changed. External modifications to the runners or flange will not be permitted.

CARBURETOR (cast iron head engine rule) - May use an unaltered approved Holley Part #4777, model #4150 650 cfm.

Only approved Holley 4150 four barrel carburetor, model 6895, and 41 50 hp series, list number 80507 with a ventura size 1-11/16 inches and maintaining a throttle bore maximum size of 1-7/16 inches.

Holley 4150 rework guidelines:
Body of carbs: No reshaping, polishing, grinding, or drilling holes will be permitted.
Ventura: No altering or reshaping of the venture in any manner will be permitted.
Boosters: Boosters may not be changed. Size, height, shape, and location may not be altered.
Throttle Plate: Throttle plate must not be altered in shape or size.
Butterflies: Butterflies must not be thinned or tapered. Idle holes may be drilled in the butterflies.
Screw ends may be cut even with shafts, but screw heads must remain standard.
Throttle Shafts: Shafts must remain standard production and must not be thinned or cut in any manner.
Carb Jets: Jets must be the same type as supplied by the carb manufacturer.
Carburetor Throttle: Two springs mandatory.

Alterations to allow additional air to be picked up other than through the opening of the ventura such as altered gaskets, throttle plates, leaks, and drilling holes into the carburetor will not be permitted. Power valves, metering blocks, and floats may be altered. Throttle linkage may be changed. Choke horn may be removed with a square cut, no taper or bevel, but may not be cut into the body of the carburetor. The air cleaner ring must remain standard.

CARBURETOR SPACER - Only 1 piece solid spacer. Aluminum heads 1 inch thickness, cast iron heads 2 inch thickness will be permitted. The spacer opening must be perpendicular to the base of the carburetor. Spacer must not be altered. Only 2 paper gaskets (one per side) maximum thickness .065 will be permitted on the adapter plate.

FUEL INJECTION OR SUPERCHARGER - Fuel injection or superchargers are NOT permitted.

AIR CLEANER AND AIR INTAKE - Air cleaner is required while car is on racing surface. Only a round type air filter and metal housing is permitted (maximum 14 inches in diameter) (maximum 5 inches in height). Top and bottom of the air filter housing must be solid. The air filter housing must be centered on the carb. No tubes, funnels, spacers or any other device which may control the flow of air is permitted inside the air filter between the air filter housing and the carb. No cowl induction is permitted. No ducts or baffles permitted leading to the air cleaner or element.

FUEL - Gasoline ONLY will be used in all engines. A fuel shut off valve is mandatory and must be mounted within easy reach of the driver. ON/OFF must be clearly marked.
FUEL PUMP - Pump must be mounted in stock locations and of mechanical design. Only 1 fuel line permitted from fuel cell to fuel pump.

FUEL CELL - Fuel cell required with the container made of steel (not less than 22 gauge steel), must be located behind the rear axle and as far forward as possible and maintain a ground clearance of 6 inches. The maximum fuel capacity, including filter spout shall be 24 gallons. The use of a commercially manufactured fuel cell is mandatory. Interior sheet metal must allow access to top of fuel cell for inspection. Fire wall of steel not less than 22 gauge thickness must be located between trunk and drivers compartment. Bladder type fuel cells highly recommended.

TRANSMISSION - The transmissions must meet the following requirements: The transmission must be standard, O.E.M. type Muncie or T-10 manual four speed transmissions are permitted. Only magnesium or aluminum transmissions housing are permitted. Only O.E.M type angle cut forward gears permitted. Square cut forward gears are permitted. Any method or transmission gear higher than 1.18 to 1 will not be permitted. The only high gear transmission ratio allowed will be 1:1. Forward gear and reverse gear must be in working order. Only manual shift linkage is permitted on the transmission. The Jerico 2 speed transmission permitted following the above rules.

CLUTCH - Multiple disc clutches are permitted. The disc clutch housing assemble or cover shall be made from aluminum or steel. Limited to steel discs and pressure plates. The minimum clutch diameter permitted is 5 1/2 inches. Clutch must be mounted inside the bell housing. NO DOG CLUTCH OR DIRECT DRIVE. Any steel or aluminum flywheel permitted. A special production all-steel clutch housing required.

DRIVE SHAFT - Drive shaft to be made of steel only! (1 piece only). Drive shaft must be painted white. It is mandatory that 2 360-degree solid steel loops are to be used to prevent drive shaft from dropping onto the track. It is mandatory at two (2) 360 degree solid magnetic steel brackets no less than two (2) inches wide and 1/4 inch thick be placed around the driveshaft and torque arm and be fastened to the cross member of the car.

REAR AXLE - Only aluminum or magnesium quick change and non quick change center sections equipped with aluminum or magnesium side bells will be permitted. Full floating rear axles mandatory. No ratchet rear. Straight rears allowed. No front wheel or four (4) wheel drive trains permitted. Live axle rears not permitted. The distance, measured form the center of the rear end housing to the rear hub, left to right, at the point the wheels bolt on, must be within 3 inches in length. Only steel axles and axles tubes permitted. The rear must be mounted so that the inside edge of the left rear tire is even with or outside the outermost edge of the left side frame rail. 4:86 gear rule enforced. Any method or transmission gear higher than 1.18:1 designed to override the gear rule will not be permitted.

9. ENGINE/CAR ELECTRICAL SYSTEM

IGNITION SYSTEM - Any aftermarket HEI, MSD or magneto systems are permitted. The distributor must mount in the stock location and maintain the same firing order as a factory produced engine for the make and model car being used. No adjustable timing controls permitted. All switches must be on the dash panel or within easy reach of the driver. A labeled on/off master switch to the battery cable must be installed on the cowl behind the windshield opening on the right side of the driver. The switch must be easily accessible and in plain view.

STARTER - The self-starter must be in working order. Gear reduction starters are acceptable. All cars must be capable of STARTING UNDER THEIR OWN POWER. After the race is underway, cars may be started by hand pushing in pit are only, but under NO circumstances is any car to be pushed onto the track from the pit area (either by hand or truck).

BATTERY - Battery must be located between the frame rails. The battery and battery caps must be securely fastened. No battery may be forward of the radiator or rear of the rear end housing of the car. Battery location subject to approval of officials.

10. ENGINE LUBRICATION

OILING SYSTEM - Dry sump oiling system must be used consisting of a single engine mounted engine driven oil pump not to exceed 10 inches in length and 3.5 inches in cross section. Wet sump allowed. Any oil is permissible. No combustion enhancing

additives are permitted. Lubrication oil reservoir tanks are not permitted in the driver's compartment.

11. COOLING SYSTEM

RADIATOR - Radiator must remain stock appearing and remain in front of the engine. Anti-freeze type coolants NOT PERMITTED.

12. WHEELS
Only 15" diameter wheels with a maximum width of 15 inches are permitted. No bead locks permitted. Bleeder valves are not permitted. Any offset is permitted. Wheels are to made of steel.

13. BRAKES
4 wheel disc brakes mandatory. Steel rotors only.

14. SEAT BELTS
All seat belts must be dated within 5 years of the current year. Belts must be in good condition and not frayed. Must be a quick release type belt and be of approval of the official. A five point sear belt harness is mandatory, 2 lap, 2 shoulder, and 1 crotch belt. Where belts pass through the seat edges, it must have a grommet installed, be rolled, and/or padded to prevent cutting of the belts. Both ends of the lap belts must be fastened to the roll bar case with high quality bolts not less than 3/8 inch in diameter. Sternum should harness highly recommended.

15. SEATS
Only custom manufactured aluminum seats acceptable. All seats must have a padded rib protector. Adequate padding headrest mandatory.

16. EXHAUST
Mufflers required. Dyno Max 24216 no I 80-degree headers. Exhaust must extend outward a minimum of 6 inches past cowl. Right side exhaust pipe may run beneath the car, but must turn down and out toward bottom of the right side frame rail.

17. FIRE CONTROL
It is recommended that each car have a built in fire extinguishing equipment, but it can not be of the dry powder type (must be halon 1211 or equivalent). ALL CARS MUST HAVE AN ADEQUATE FIRE EXTINGUISHER securely mounted within reach of the driver. All entrants should have in the pit area as part of their equipment, at all times, a fully charged 10-13 pound dry chemical, halon or its equivalent extinguisher.

18. SAFETY
All drivers must wear an approved helmet (minimum Snell 95). Nomex fire suit (minimum 2 layer recommended) and Nomex gloves are required whenever the car is on the speedway, Nomex hood, socks, and underwear is also recommended. A full face shield or goggles are mandatory. A lull face helmet is also recommended.

19. TIRES
Hoosier Tires. Compound to be announced. ABSOLUTELY NO TIRE SOFTENING OR CHEMICALLY ALTERING OF THE TIRES natural compound or integrity. Durometer reading must be consistent with the manufacturers suggested specifications for given compound. Tire durometer readings will be checked. A tire minimum softness may be declared at the beginning of a race event. Penalties for rules infractions will be severe and final. Track management reserves the right to impound competitors tires for random testing at any time.

EVERY COMPETITOR MUST MAKE THEMSELVES AWARE OF AND FAMILIAR WITH THE TECHNICAL RULES IN THIS CLASS. EVERY INDIVIDUAL AGREES TO BE KNOWLEDGEABLE AND BOUND BY THE CONTENTS OF THE 2002 TIOGA MOTORSPORTS PARK RULE BOOK.