Dig Or Die=I Die
Join Date: Oct 2007
12sws27 is offline
Re: modded 4.3 vs v8
The l31 is fine. I'm just saying ,it depends on what it's going into and whether you plan on keeping it EFI. What trans is going to be used matters too.
I just went back through the thread and still didn't see where the OP mentioned what year truck he had. But I did see he had a 2.8. So that tells me it's a first gen and doesn't have a vortec PCM.
He has a 95 CPI 4.3 he's thinking of putting in. I think that will be way more work then what it's worth. But if he has the harness and the PCM then he won't need the PCM flash. Well unless the 95's transmission is a 4l60e and he's not going to use it too. If the 95 PCM did control the trans and he doesn't plan on using if he will have to turn off all the codes he'll get.
There's always so much more to it then just get an engine and drop it in. Especially when it comes to EFI.
If the Op has a 1stgen that doesn't have a PCM controlled trans, then a L31 with a aftermarket intake and carb would probably be best. But then you got to think about what trans he is going to use. IDK if the trans that was behind his 2.8 with bolt up to the 5.7.
1998 GMC Jimmy, 2dr/2wd, 4.3L auto: Wynjammer S/C @8psi, Accel 300+ ign box, Taylor 8mm wires, CFM-Tech tb blade, Trans-Go shift kit w/vette servo, cat delete, Hooker Maxflow muffler, Zexel Torsen LSD, Marine intake, 42lb/hr injectors, aeromotive stealth 340 in-tank pump, racetronix fuel pump wiring harness, AEM UEGO W/B A/F gauge, LS1 E-Fans, self tuned w/HPTuners, best 1/8th mile E.T. so far: 2.26 60' 9.55@73mph <<<6psi.