| Small Block Chevy Engine Block Identification General Engine Block Specifications While 6 different bore size blocks have been produced, the small block engine can be classified into 3 bore sizes and 3 main bearing sizes. 283 blocks (3.875" bore, 2.3" main), 302/327/350 blocks (4" bore, 2.3" or 2.45" mains), and 400 blocks (4.126", 2.65" mains). In 1968 the main bearing saddles were increased in size from 2.3" to 2.45". CID Year Bore Main Cap 262 1975 3.671 2 bolt ONLY 267 1979 - 81 3.500 2 bolt ONLY 305 1976 - 96 3.736 2 bolt ONLY 307 1968 - 73 3.875 2 bolt ONLY 327 1968-69 4.001 (2.3" main) 2 bolt 350 1968-88 4.001 (2.3" main) 2 bolt 265 1994 4.001 (2.45" main) 2 bolt 302 1968-69 4.001 (2.45" main) 4 bolt 350 1968-96 4.001 (2.45" main) 4 bolt 400 1970-72 4.126 (2.65" main) 4 bolt 400 1973-80 4.126 (2.65" main) 2 bolt Notes: 2 bolt ONLY means what it says. You will NOT find a 4 bolt 305 block (made by the factory). Period. Otherwise 2 or 4 bolt can mean either design... Engine Code Stamping Numbers All engines are stamped with an engine ID code, consisting of assembly plant code, production date and suffix code. V8 codes are stamped on a pad just forward of the right side (passenger) cylinder head. 6 cylinder engines are stamped on the passenger side of the block behind the distributor. The engine date must precede the car build date, otherwise something is amiss. Some engine machining operations (decking) will obliterate the engine ID. Engine ID Code Example: V0101CLJ - (V = Plant, 01 = Month, 01 = Day, CLJ = Engine Suffix Code) Engine Plant Code Flint (Motor/6-cyl) F Hydramatic H St. Catherines, Ontario K (McKinnon Industries Canada) GM of Mexico M Saginaw Service S Tonawanda T Flint (Engine/V8) V Casting Clock On some Saginaw blocks, intakes and exhausts a "clock" was cast into the block. The clock is a circle of 10 dots, one dot for each hour of a shift (usually 10 hour shifts). An arrow points to the beginning of the shift an another dot outside the circle indicates what time of day the cast part was made. Anyways, that's what that circle thing is (if you happen to see it on something). Casting Date Small block casting date is located on driver side rear of block on flange forward of bellhousing. Big block on the right side of engine above the oil pan rails. Casting Date Example: E038 - (E = Month, 03 = Day, 8 = Last digit of model year (1978)). Month: A = Jan, B = Feb, C = Mar, D = Apr, E = May, F = Jun, G = July, H = Aug, I = Sep, J = Oct, K = Nov, L = Dec VIN Code Format The vin code format is stamped onto most engines. The format consists of divisional identification number, model year, assembly plant designation and vehicle serial or sequence number. In 68-69 model cars, the serial (VIN) number of the car the engine was installed in is stamped next to, or under the engine code ID. Starting in 1970, the serial number is stamped either above the oil filter, somewhere on the block pad (in front of the cylinder head), or on the transmission flange somewhere. Chevrolet issued technical service bulletins to indicate which engines were to recieve a vin stamp, so who knows what could have happend (or not happened). VIN code format Example: 13N100001 (1 = Chevrolet, 3 = 1973, N = Norwood, 100001 = Production sequence) Engine Block Casting Numbers Notes (for below): "High Power" is the maximum rate HP this block was used for, "Low Power" is the lowest rated horsepower RPO engine the block was used in. "Main Caps" is the number of bolts holding the cap. A "two-bolt" main, or a four-bolt main. Four bolt main blocks are desirable in high performance applications because the extra strength of the additional bolts keeps the bottom end rigid and less prone to failure. However, a properly prepared 2 bolt main engine will work just fine (often times you'll lose a rod bolt before you break a crank because it's "only" a 2 bolt main). Years Casting CID Main Caps Comments 1980-85 140029 350 - - 2 car 1973-80 330817 400 - - 2 car, truck 1975 355909 262 - - 2 car, truck 1976-85 355909 305 - - 2 A 1975 360851 262 - - 2 Monza 1976-79 361979 305 - - 2 car, truck 1978-86 366245 350 - - - car 1982-86 366286 350 - - 4 Chevrolet, siamese 1982 366299 350 - - 4 Chevrolet, aluminium 1956-67 383810 283 - - 2 - 1967-68 389257 302 - - 2 Z-28 1968-73 391436 307 - - 2 - 1965-67 393288 283 - - 2 car, truck 1976-79 460776 305 - - 2 car, truck 1976-79 460777 305 - - 2 car 1978-79 460778 305 - - 2 car, truck 1979-82 471511 267 - - 2 car, truck 1976-85 581671 305 - - 2 A 1985-94 1489363 350 - - 2 - 1979-82 2135412 267 - - 2 - 1979-82 2404929 267 - - 2 1973-76 3030817 400 - - 2 car, truck 1958-61 3556519 283 - - 2 car, truck 1955 3703524 265 195 _ 2 car, no filter 1955-56 3720991 265 195 225 2 car, truck 1957 3731548 283 220 283 2 - 1956-67 3736935 283 - - 2 - 1957-59 3737739 283 220 290 2 car, truck 1958-62 3756519 283 230 315 2 car, truck 1956-67 3756935 283 - - 2 - 1962-65 3782870 327 250 375 2 car, truck 1956-67 3789187 283 - - 2 - 1962-67 3789817 327 210 275 2 car, truck 1961-64 3789935 283 230 315 2 car, truck, Vette 1966-67 3790721 283 - - 2 Chevy II 1964-67 3791362 327 300 300 2 Chevy II 1958-62 3794226 283 220 220 2 truck 1968-69 3794460 327 250 250 2 truck 1968-69 3814660 327 - - 2 F A 1968-69 3814660 302 - - 4 Camaro, Z-28, Vette 1956-67 3832338 283 - - 2 - 1956-67 3834812 283 - - 2 - 1958-62 3837739 283 - - 2 - 1957-66 3849852 283 220 - 2 car, truck 1956-67 3849859 283 - - 2 - 1956-67 3849935 283 - - 2 - 1964-67 3852174 327 - - 2 car, truck 1968-76 3855961 350 - - 2 car 1964-67 3858174 327 300 - 2 A 1964-67 3858180 327 250 - 2 - 1962-67 3858190 327 - - 2 - 1966-67 3862194 283 - - 2 Chevy II 1962-66 3864812 283 230 - 2 car, truck 1964-67 3868657 327 300 - 2 1962-67 3876132 327 - - 2 1963 3889935 283 - - 2 truck 1962-67 3892657 327 - - 2 car, truck 1967 3892657 302 290 - Z-28, small journal 1968-69 3892659 327 210 - 2 1962-66 3896944 283 230 - 2 1965-67 3896948 283 - - 2 1964-67 3903352 327 250 - 2 1969-80 3911460 350 - - 2 A 1968-73 3914635 307 - - 2 car 1968-73 3914636 307 - - 2 car, truck 1968-69 3914638 327 - - 2 1968-73 3914653 307 - - 2 A 1968-69 3914660 327 250 - 2 truck 1968-69 3914678 302 290 - 2/4 Camaro, Z-28 1968-69 3914678 327 210 295 4 car, truck 1968 3914678 350 210 295 4 cars 1965-67 3932288 283 - - 2 A 1956-67 3932338 283 - - 2 1974-75 3932368 350 - - 2 1969-73 3932371 307 - - 2 car,truck 1969-73 3932373 307 - - 2 car,truck 1968-69 3932386 350 300 350 4 LT1,4 1968 3932386 327 - - 2 A 1969 3932386 302 290 - 4 Camaro,Z28 1969-76 3932388 350 165 300 2 car,truck 1968-69 3933100 327 - - 2 1968-69 3933180 327 - - 2 1968 3941174 307 - - 2 truck 1956-67 3949852 283 - - 2 1973-80 3951509 400 - - 2 car,truck 1970-73 3951511 400 - - 4 truck 1962-67 3953512 327 - - 2 1968-69 3955618 327 - - 4 A,F,Vette 1969 3956618 302 290 - 4 Z28 1969-79 3956618 350 165 350 4 car, truck, vette 1969-76 3958618 350 - - 2 A 1962-63 3959512 327 250 - 2 1956-67 3959532 283 - - 2 1968 3970010 327 - - 2 A 1969-79 3970010 350 185 370 2 or 4 car, truck, Vette 1968-76 3970014 350 - - 2 car,truck 1969-73 3970020 307 - - 2 car,truck 1968-76 6259425 350 - - - car,truck 1980-84 14010201 305 - - 2 car,truck 1980-84 14010202 305 - - 2 car,truck 1980-84 14010203 305 - - 2 car, truck 1980-82 14010205 267 - - 2 - 1980-85 14010207 350 - - 4 truck 1980-85 14010209 350 - - 4 truck 1978-86 14010231 305 - - 2 - 1979-82 14010280 267 - - 2 car 1982 14011064 350 - - 4 Chevrolet, high tin 1979-82 14016375 267 - - 2 - 1979-82 14016376 267 - - 2 car 1978-85 14016379 350 - - - car, truck 1980-84 14016381 305 - - 2 car, truck 1978-88 14016383 305 - - 2 - 1979-82 14040205 267 - - 2 - 1978-86 14049047 305 - - 2 1986-94 14079287 350 - - - 1987 14088526 350 - - 2 Camaro 1986-94 14088548 350 - - - - 1986-92 14088551 305 - - 2 - 1988-94 14093627 305 - - 2 - 1986-94 14093638 350 - - - 1988-94 14094766 305 - - 2 1986-94 14101148 350 - - - 1987-88 14102058 305 - - 2 1969-85 14316379 350 - - 2 |
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