Help: 5.7 gas motor

[Fry Daddy]

Please don't shoot mister. I was wonderin' if anyone out there could tell me what is involved in swaping an '04 5.7 vortec boat engine w/external fuel rails into my '98 chevy truck. The engine looks the same exc. for the fuel rails. I have a 5.7 vortec w/5spd. trans. Any help would be appreciated thanks

 

[408.Luke]

probably not the best place to answer this question, i would try ls1truck.com theres people there that could probably answer that question a little better.

could it be done,yes anything can but my question is why?

 

[McRat]

Please don't shoot mister. I was wonderin' if anyone out there could tell me what is involved in swaping an '04 5.7 vortec boat engine w/external fuel rails into my '98 chevy truck. The engine looks the same exc. for the fuel rails. I have a 5.7 vortec w/5spd. trans. Any help would be appreciated thanks

If it is not an LS1 (unlikely), and the 98 truck is not, you should be OK. Unless it was a twin-engine boat and you grabbed the counter-rotating engine.

There are two kinds of V8 engines produced in that time period, LS1 and "SBC style". You can tell by the exhaust manifolds, if the two center cylinders have a siamesed port, it's SBC. If each exh port is spaced equal, LS1. Nothing is interchangeable between the two. Both are advertised as 5.7, both have the same bore-to-bore spacing, and bolt up to the same bell housing, but the way the engine is controlled is very different.

 

[LarryJewell]

welcome

 

[THEFERMANATOR]

It will be a fairly straight forward swap if you re-use your stock 98 PCM and have EFILIVE to tune it. The stock MEFI-4 controller won't fair to well in marine tuning for the street, but I have heard of some doing the 0411 PCM swap from an 01 van to the marine engines and GM performance engines that used MEFI-4 or MEFI-5 fuel injection. You'll want to swap the camshaft as the stock marine cam will perform like crap above about 4400(but realistically starts dieing off around 4000-4200). Check over at EFILIVE.com for the 0411 PCM swap and also look up on fullsizechevy.com for the marine intake swap. This is a popular swap on the 350's as the stock CSFI that GM used sucks to say the least in slightly modded form, and is marginal even stock. GM still today produces the old tried and true L31 5.7L engine like was used in 1500/2500's from 96-98 and 3500's up until 00. The only LS based engine they use in marine is the 6.0L as the aluminum heads of the 5.3L worry many in the marine industry for electrolisis and corrsion. I believe also you can get software to tune the MEFI fuel injection from MSD and ARIZONA SPEED if you want to go that route.

I know a bit about the marine engines, so if you have any specific questions ask away and I'll try and answer them.