| Ford 300 I-6, with 3 x 1 carbs/intake |
| Started with a "Jasper" rebuild 1983 block with @30,000 miles |
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| inline surfers July '07 |
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| The intake and carbs were tested and tuned on a good running 300 in my '78 F-150. I 1st blanked off the end carbs and got it running using only the center carb and a factory exhaust manifold. It ran good the first try :). |
| later model EFI exhaust manilfolds |
| Completed intake: mild steel runners were Tig welded to cast intakes. There were pre and post heated, and completed in a series of small areas. there are hair-line small cracks in casting next to the welds, but none leak. vaccum readings are good on running engine. |
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| Left side pictures: making the intake......... I first got 3 factory intakes and cut the center sections i needed out, below are 2 that have already been sandblasted. |
| Below: I just checked the bearings and cleaned and painted the short block. Head's going to get some more attention later. |
| Below is a current picture of carbs and intake, they have been test run on another engine, but just mocked up here for engine mount/radiator/firewall fitment. Heads coming off for 3 angle valve seats, backcut intake valves and match porting the intake and exhaust runners soon. |
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| I made these 3, 1" spacers out of Phenolic material, they will rotate the carbs 90 degrees so i can run the "progressive" linkage inline. It will idle on center carb only. |
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| Left: 3 plates made from 1/4" steel, for the bottom of the intake manifolds. They bolt in place of the factory exhuast manifold, which used exhaust gases to heat manifold. I'm going to use anti-freeze, piped in through larger 2 holes (later i modified and closed one of the front and back carb plates holes due to exhuast clearance issures) WHY HEAT the INTAKE? follow these links Inliners International "Intake Heat" tech page |
| Below are the same Phenolic spacers, steels plates with hardware and fittings. Also is the square 1/4" wall tubing i used to make the "runners" that goes between the carbs. I spent alot of time making these so that there isn't much misalignment between these and the cast intakes. |
| A couple mock-up pictures of the intake. runners were welded with intake bolted to cylinder head. |
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| 2 more pictures taken during the test stages............ |
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| I'm using factory YF carbs, i rebuild all and removed the chokes and idle circuts from the ends carbs. Also blocked acouple vaccum parts and massaged the lower butterflies to close as good as possible to limit the amount of vaccum leakage while running only on the center carb. |
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| I was very happy with all the test drives in my 78 F-150. I got the progressive linkage working good, and still have room for more adjusting later. It starts, idles and runs with less than 2/3 thottle on the center carb only. It ran noticably better with the 3 carbs, i wasn't sure what would happen since i was using the factory (very restrictive) exhaust manifold. Can't wait to see how it performs on a mildly prepped head with EFI exhaust manifolds. fyi, i'm using the factory camshaft, i want a smooth idle. On "test" engine, it idled so smooth you almost couldn't tell it was running, note on lower picture Vaccum Guage is reading about 18". |
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| Cylinder Head: I'm not building for maximum horsepower, i'm keep a factory profile camshaft. I want to maintain a super smooth idle. But, that doesn't mean i can leave everything as is. Below: pictures document the work done to the cylinder head. |
| Using Fords factory DuraSpark II ignition: The stock electronic ignition system is pretty good and simple. There are only 2 wires going to the factory harness, and both come from the ignition switched 12 Volt source. The Ballest resistor is bypasses during engine cranking to give the Coil full 12-Volts. Note: continuous 12-Volts will burn up a factory coil, the resistor drops the voltage too about 6 or 8 volts. The white wire is optional, it retards the the spark a couple of degrees make starting easier. When selecting a module, use the "blue strain relief or 49 state" module. |
| pictures & info from FordSix.com and FalconPerformance.com |
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| click on below picture or link to see slide show of 3 x 1 carburator linkage operation (poor quality)..... |