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Thread: anybody know anything about chevy

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    anybody know anything about chevy

    what im doing is i have a truck and its tbi right now but im swapping in a carberated motor and wondering what all i have to do.i know i need a fuel presure regulator and fuel pump.im just wondering about wiring. is it just a str8 swap?

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    specs on truck?
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    1987 chevy shortbox.was a 6 cy to start and someone put a 1990 tbi 350 in it and i want sbc carbed.the tbi motor is bagged out so im going to stick in my motor out of my regal.its not the stock buick motor.

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    Why not swap intakes and keep it TBI? Lot of advantages over the carb.

    Fuel pump or regulator to bring the pressure down to ~5psi. Your Check Engine light is gonna be on (hey... where's the engine?). HEI distributor... pretty sure TBI motors are just a pickup for the ECU (cam sensor) to decide when to fire the coil.
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    there shouldn't be a problem with a check engine light on it, he said the truck originally had a carb'd motor that was swapped to a 1990 FI motor, now he wants to swap it back.

    Its probably easier to swap back then it was to swap the newer one in since carbs don't need as much computers and electronics to run compared to Injected.
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    I'm not sure about the 6 cyl 87's but the 8cyl 87's were TBI.

    From my understanding you can't just swap intakes and keep the TBI. When I researched putting my 87 back to TBI I found out that I couldn't just swap my intake and make it TBI. Apparently the bolts used for holding the carb intake down are mounted at a different angle then a TBI intake so you would require a whole different block or re-drill everything.

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    you can get an adaptor to put the TB on the carb intake or you can slightly modify the center 2 holes on each side of the intake manifold to mount it to the carbbed block.
    87 was the first year gm used tbi in there trucks, so I would suggest keeping it tbi, its a far better system than a carb and its very simple.

    If your set on going with a carb, completely tear out all the original 87 wiring and get a harness out of an 81-86 truck and swap it in.

    You could make your own, but easier to get it from a carbbed truck. Basically power to the coil, power to and from the alternator, you could keep the existing start power wires and ignition wires.
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    well the reason im going to carb is cause the tbi motor is way tired and needs to be replaced and the tranny on it is junk also and i have a really strong 350 with all edelbrock on the top and msd ign and a good tranny with a shift kit ready to go in and i my self dont really know much about tbi. i found out abit more info on it from full size chevy and they say all i got to do is put a fuel presure regulater in,switch fuel pumps as the tbi is in the tank so either go inline electric or go manual on the motor. as for the engine light yes im pretty sure as soon as i unhook the computer its going to go on cause theres no motor there.it does work now cause i see it come on every now and then. im just wanting it carbed so i have so many more opitions with it.eg big block,older style motors.less electrical stuff to deal with.sensers and stuff like that.

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    I would go find an 73-86 truck in a scrap yard, pull all the wires out from under the dash and around the engine. Also grab the guages. It will be proper, not extra wires laying in there that have been cut etc. It'll look clean and like it was supposed to be that way.

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    i just recently put a carbed 454 in my 87 chev 4x4- i just separated the starter,alternator and distributor wires from the harness and zip tied the rest of the wires to the firewall-pulled the couplers off the 2 fuel relays on the firewall-put a bolt with some sealant in the return line-the mechanical pump has no problem pulling the fuel through the pump in the tank- i'm pushing just under 500 horse with a 850 cfm carb and have no issues--did not pull the ecm fuse and have no engine light on-do not change or cut the harness there is no need to-u may want it if u sell or convert it back -later Peter

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