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Thread: Ford six F.I. on a GMC inliner?

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  1. #1
    Carb and Points!
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    Ford six F.I. on a GMC inliner?

    Just checking out possibilities-How hard is it to use a Ford 300 six fuel injection set up on another six? I'm looking for a way to set my 302 GMC six up with fuel injection,and thought the 300 inch Ford six set up might be an easy way to do it,plus it's close enough in size to not require much tuning to run well. I'm assuming the F.I. needs a higher pressure fuel supply,it may need a special distributor and possible a bunch of wiring and sensors;is it even possible to convert it into an old truck like my '54 GMC?
    Another option I'm looking at is a TBI from a Chevy 305,but I'm not sure how to make an 8 cylinder system work on a 6 cylinder engine. Maybe a 4.3,but I'm told none of those were fuel injected. I guess the question is,how would YOU go about it?
    Speed

  2. #2
    Super Moderator dave w's Avatar
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    I have experience doing EFI conversions and tuning. What I would do might not be an easy or low cost option for you?

    I'm not familiar enough with the GMC 302 six cylinder, so I would first need to first figure out what is needed to get an EFI 8 pin ignition module working in the GMC 302 six cylinder distributor. Once I got the distributor using an EFI 8 pin ignition module, I would use the GM TBI system from a V8. I would modify and tune the PROM chip programming for a 302 six cylinder.

    dave w

  3. #3
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    TBI is probably the easiest choice. The old Jimmy sixes are three port engines and the firing order causes uneven pulsations from the different ports. PFI on a three port manifold could cause unequal fuel distribution. I'd probably attempt to design an intake with dividers that extend into the head if possible in order to facilitate a port conversion.

  4. #4
    Carb and Points!
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    I'm inclined to agree on that;the plan I was thinking of would be mounting a TBI on the stock intake (Since it's already a 3 bolt 2 barrel,like an old Stromberg 94 or 97,it'd just be a matter of making an adapter plate.),and I know I can modify a later GMC or Chevy straight six distributor,(even an HEI) to work in this engine. My biggest concern was finding a straight six distributor that's compatible with EFI,but it now sounds like I'll have to "build" one. Can the 8 pin module be mounted externally? There's not a lot of room inside those distributors. I assume I'd make the distributor fit the GMC block then use an EFI distributor for a model to fit the newer components. I know (I THINK) I'd have to get the ECM from whatever I get the module etc. from,all the wiring that relates to it,and most of the sensors etc. I was told earlier by a guy who installed TBI on an older Chevy truck I'd only need something like 5 wires from the harness and a couple of the sensors to make it run,due to not having all the electronics to wrestle with,is that right? (Sounds TOO simple to me.)Whatever happens,once it gets to the "modify and tune the PROM chip" segment,I'll have to farm that out. I don't have the tools,or the brains,to get into that. Speed

  5. #5
    Super Moderator dave w's Avatar
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    The 8 pin HEI module can be mounted outside the distributor. Using the Ford type pickup coil can save space under the distributor cap. The pictures show the 4 pin HEI module, which is similar in size / mounting to the 8 pin HEI module.

    With some careful planning, the original distributor can be modified like the distributors shown in the pics below.

    dave w

  6. #6
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    There are definitely 6 cylinder TBI setups right out of GM. The 4.3 engines came in TBI in both cars and trucks and they were equipped with a distributor. The early distributor uses the same electronic ignition system as the carbureted HEI engines with four additional pins to communicate with the computer. There were also 2.8 TBI engines which were six cylinder and distributor equipped. If you can adapt an HEI distributor then you can substitute the 4 pin HEI module for 7 pin HEI module from a CCC equipped vehicle such as a Carquest 55-1541.

    At the computer end, if you have an early computer you need to get a six cylinder chip to put inside. If you have a later computer you'll need a six cylinder memcal. Neither is impossible to find.

    What's nice about using a computer for the ignition is that you can get exactly the timing you need at a specific load and rpm. It can make the engine respond so much better overall.

  7. #7
    Carb and Points!
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    Okay-I see what we're doing now. Now,the NEXT dumb question;What engines do I need to source what parts from? I have a Chevy six HEI distributor I've already modified to fit the 302 GMC motor;will this work as a base for the 8 pin module and related components?
    Speed

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