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Thread: 4.3 to V8 swap?

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  1. #1
    Well I decided to do the factory computer with the swap I got a harness out of a 99 silverado 5.3 got it all pulled and someone had cut the harness going to the oil level, crank sensor, and starter silenoid wire so I got the oil level sensor harness pig tail off e-bay and the crank sensor pigtail harness from oreily's I should be be able to solder a loop for the starter, I also got the fan shroud, upper radiator hose and engine mounts just need the brackets. As far as the engine I will wait until tax return, a 4L65e from daumer powertrain is $1000 and the LS3 or L92 is about $4000 there I am a little concered about using the L92 due to having to swap a bunch of stuff on it for my PCM stupid variable timing, I like the truck engines due to the fuel system and the accessories but I want to start out with something over 400hp!

  2. #2
    Join Date
    May 2009
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    for what it's worth, i regularly see about 450+ mi per tank & that's with a 5.3 in a 4x4 with 3.73s
    heck, i got 22mpg once with the 4.3 before i broke it.

    even with the car engine, you'll still wanna use the truck intake because it flows a little better on the bottom end, which would be better for a truck (unless you plan on being like Quik & Spoolin and living around 6000-7000rpm)

    as for going F/I on the 4.3, talk to Allen - he's done it a couple times
    00 FRC - just top end, exhaust, and a hot-air intake
    99 Sierra - 5.3 / 5spd
    ↓ click the pic for the build ↓

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