Tiger8120

So I have a 1997 firebird formula with an lt1 in it and I'm doing an lt1 to ls3 engine swap. My question is on the wiring harness, will a harness and computer from a 98 ls1 trans am work for an ls3?

Naf

iTrader: (1)

No, you have to either stick to an LT1 engine, or get a stand alone harness for the engine.

ryeguy2006a

iTrader: (27)

Anything is possible, but you are going to have a tough time with the cam and crank sensors. The Cam is 1x on LS1 and 4x on LS3. The Crank is 24 teeth on LS1 and 58 teeth on LS3.

I know that they make a conversion box for the cranks, and I think people are using the early LS2 cam gears that have a 1x cam sensor on the front. You would probably need to use that cam gear and sensor along with a conversion box for the crank. Other than that it should be pretty possible.

Many people have done LS3 swaps on 4th gens.

ryeguy2006a

iTrader: (27)

Oh, and the fuel tables are different for the 98's, so if you are going that far you might as well upgrade to the 99+ ecu's.