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Originally Posted by Pauly
They dont not make a CSFI to MPFI conversion kit for teh Vortec trucks.
peace
Pauly
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So, sorry for derailing this thread. there are other options besides the marine intake to convert the L31 to MPFI, such as the ramjet 350, or custom modified carb-to-vortec heads intakes like the Edelbrock Victor Vortec intake (I think that's its name)
here is the intake that I have been talking to Pauly about, I am preparing to put it on my '96 L31, along with several other mods:
(the pic is actually from the fellow I bought it from who had it on his 383, hope he doesn't mind me using this picture of it.)
It is basically a GMPP TBI intake that mates up with Vortec heads, it was modified for MPFI and to accept the stock Vortec Throttle body and all regular emissions stuff like EGR and EVAP.
although, if the one I got wasn't already modified and setup to go on a L31 prior to me getting it, I would have gone with the Marine intake, because if starting from scratch, it would cost more to modify and make it work, than it would be to do the Marine setup with its modifications.
So there are other alternatives to the Marine intake, but despite its somewhat large cost, it is actually one of the more affordable options out there for curing the L31's fueling problems.
In answer to your original question, the stock intake will probably do just fine for you if you're only planning on a custom tune and exhaust setup (that is somewhat my setup at the current time) but even with just minor things such as a tune and exhaust, the marine will still help, I just don't know if it's worth the price at that point....however if you plan on doing mods like a cam, heads, boost, whatever, at any time in the future, a MPFI intake WILL be able to let the engine breathe better and be able to fuel it correctly, where as the stock 19# poppets, and poorly flowing stock intake, will not be able to do it very well, and in turn your HP and TQ will suffer, and possibly the driveability and longevity of the engine (a larger need for fuel + limitations of stock intake = lean conditions).
EDIT: spelling
'96 ECSB 5.7L, 411 PCM, EFILive V1 self-tuned, LC-1, ZZ4 cam, Custom MPFI w/ 24# Bosch 890's @ 45psi, headers, catback, Detroit Truetrac, 3.73, 1.52 RRs, 75mm TB, sound deadened, DEH-P600UB, Polk comps/10", kicker amps. In the works: T56, Mark VIII fan, distributorless coil near plug setup.
