Quote Originally Posted by bramos
Whats up RedHeartBeat, read this thread (OBS to LSx conversion) like 3+ times its great. Just had a few questions (haha im sure thats how it always starts). Im about to attempt a swap my 1998 chevy 1500 350 5.7 4x4 auto to a 5.3l 4l60e 4x4. Since its not gonna be an ls1 do i still need the high pressure fuel pump and lines? The wiring harness from nelson does that just plug into the stock computer? Some of the threads half different results with things like abs,cruse control and a/c what the best route if attempting to preserve the luxuries? (a/c my biggest concern cause i live in phoenix) Thanks for any help with these ?'s Brian
There are many solutions to your conversion. For the fuel pump, use your existing pump and lines and adapt them accordingly. The fuel rail on your donor engine will mandate how to make the connections. If you have a single line fuel rail the Corvette filter is the way to do it. If it has a return line then you can use both of the original lines. The Nelson harness will supplement the factory original harness, you graft it into the 5.7 harness leaving the stock unit in place. Check your PCM and see if the last three numbers on it are 411. If so let Allen know and he'll send you the best tune he can for that PCM. If you're going with the Nelson harness, call them and see what all they recommend for the PCM. Its very common to have two PCMs installed in a 1998 model truck conversion, the 98 and the LSx PCM. What you do is remove all the connections from the 98 engine and leave them in place, then you install the Nelson harness and graft them together. After you're finished you just cut all the loose wires out of the harness. Search the site for alternatives for maintaining your stock A/C unit. I myself use the Street and Performance high right side A/C kit using a Sanden 508 compresser. Their website is Welcome to Street and Performance and they have some quality part though the prices are at a premium since they deal with street rodders. Cruise control, I don't have it. ABS is possible by leaving the stock PCM in place and you tie the speedometer wiring to both PCMs.