I have a 2002 single cab with a 4.3 and I want to swap it to a ls soon, I already have a 5.7 ls1 out of a 2000 corvette and I need to know what all needs to be changed to be able to run it. I read on a page that the harness will not plug straight into the fuse box like the 4.8 and 5.3.

 

Installing a 2000 5.7 Corvette motor into an 2002 OBDII vehicle will be difficult. You'll likely have to find a new Corvette ECM to do it properly as well as new motor mounts and possibly the exhaust system.you'll also need to change the intake parts out as they are not going to work from a V6 4.3 to a V8 motor.