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Old 12-15-2008, 04:30 PM
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4.3 TBI to carburetor help.

I bought a nice running,but rusted out 91 S10 for powertrain for a 41 Chevy pickup.Was thinking first off of keeping it computerized,and pulling all the harness out of the S10. I have no clue about even"simple" TBI electronics, so after searching old threads, have decided to go with an Edlebrok intake and electric choke carb.I do know I will need a 4.3 HEI ignition out of a 85-86 Astro van or C10. Will I have to do anything to the trans. to keep it working properly?It will be a 700R4 I assume? Also I already have a new 600 cfm Edlebrock carb. w/electric choke sitting on the shelf.Is it going to be to big for this motor? Or could it be jetted down a bit, and work not to bad? Thanks for any help, Jim

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Old 12-15-2008, 11:30 PM
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I take it that this street rod will be a driver and you want the 4.3 for fuel mileage? Edelbrock makes a manifold to convert the tbi to Carb. I would use a edelbrock 500 CFM 4 BRL. The 600 might be a bit big. You can also purchase a 4.3 V-6 non-computer HEI from Summit or on Ebay. For the 700r-4 transmission to work correctly Painless wiring makes a lock up kit. This allows you to manually determine via a dash switch if you want converter to lock up or not. It also has a Vacuum switch that allows the trans to lock up when engine vacuum is steady like at cruise speeds. It is very simple to install and the trans works normally with the added control if you want the converter to lock or not without using a computer. .
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Old 12-16-2008, 12:17 AM
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If you don't want to spend the $$ for the lockup kit you can wire it up pretty easy. 12V to Pin A on the 4-Pin connector & use a toggle switch to activate it when you get on the freeway. The kit below locks up in 4th gear only, when the trans down shifts it will disengage lockup. You'll need a TV Cable geometry corrector for Edelbrock carb and TV Cable/Throttle cable bracket also.



Lockup wiring Info>>

TV Cable & Lockup Info>>>>

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Old 12-16-2008, 05:02 AM
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I would use a 525 road demon jr. carb. It has annular boosters that will give it real sensitive throttle response almost as if it still had injection.
The second best carb would be a Rochester Quadrajet.
I don`t know if you plan to build this engine, but if you don`t I would install a cam and a timing chain. There`s many mods you can do to a 4.3 that really wake them up. You can install vortec heads and a edelbrock vortec intake, D-dish pistons with a tight quench, a isky roller cam, a set of headers, tune it up with spiral core spark plug wires, tune it and it`ll surprise you with how quick it revs, it`ll also make good power and mileage. If you have it built, I would recommend getting it balanced as these engines are known shakers.
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