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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine> 1996 - L31 Vortec Rebuild - Flat tops or Dish stockers?
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Topic Review (Newest First)
04-16-2017 05:50 PM
Calderone Test Drive!

You Tube
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04-13-2017 09:36 AM
BuzzLOL The Weiand Street Ram is also known as the Holley Stealth Ram... same part number... here's an article on installing, dynoing, and using it at the track:

Holley StealthRam Intake - Installation, Dyno - GM High-Tech Performance
04-12-2017 06:40 PM
BuzzLOL We forgot, because of Vortec in the thread title and it's been 8 pages...

Street Ram comes unpolished for non-Vortec heads:
04-12-2017 04:18 PM
Calderone True, i catched that, we have AFR 0912 thou
04-12-2017 01:25 PM
BuzzLOL This Vortec Stealth Ram 7542P would work better... and the Yukon prolly has the hood clearance:

May be available unpolished for Vortec heads for $350 less... unpolished 7542 was discontinued, but may be in stock somewheres... or could make one from a tunnel ram base and some other kind of plenum...
04-12-2017 01:14 PM
AutoGear If the OP still has Vortec heads....I don't think that manifold is gonna fit? Its listed as 1957-95; not sure how it doeals with the mid 80s bolt angle change either?
04-12-2017 12:14 PM
Originally Posted by hcompton View Post
One of these even with the stock throttle body should move a lot more air and not log jam at higher rpm.

early ls throttle body is good choice with cable throttle and larger bore gm tps.

q45 is a nice large one 95-104 iirc MM throttle body. These do the trick. both may require some mods to make work the stock tb might do the trick at first. maybe open it up a bit with a port. I would bet a few modes to the stock tb would help then upgrade when the tune is stable. If dyno tuning then do all the upgrades at once maybe even buy a big after market tb I think the 105 mm can be had in the $300 range.

X2 this is a great way to go rather than messing around with the miserable GM production injection system on the L31s.

04-12-2017 07:33 AM
Calderone Long time no see, the truck is alive and running great!
We finally aborted the 411 mission since we almost got scammed by certain tuner.
We ordered a Blackbox from PCMForless and we are still running the stock pressure spider upgrade
we were recommended a 36lb spider for the tune but the stock runs fine, we removed EGR
the truck runs fine, it's way quicker and screams with the 3600 Yank when you mash it but it's
not that impressive violent, we know that we are still using the stock intake and spider so we have two options here :
1 - Get the 36lb Spider and check it out and stay there.
2 - Make a plan for a ramjet or selftune intake?
We have time now that the truck is running pretty good, we can plan and then execute.
I will record a video of the new sound and feel.
07-11-2016 01:40 PM
Calderone True, Thanks Hog!
07-11-2016 01:37 PM
Originally Posted by Calderone View Post
Here's the stock L31 Camshaft (Short pin)
and the Hotcam with the Long pin.

i cannot find the correct length for the L31 pin
and the stock casm is sold.

Should i cut it or press the dowel in?
From GM about the LT4 Hotcam
"For LT1 and L98 engines for MY 1995 and older, the dowel pin at the end of the cam should be pushed in so extension from the end of the cam is 0.30" + or -, the same as the production part. For 1996 LT1 and LT4 engines 1996 and newer the dowel pin is in the correct position, extending 0.620" from the end of the camshaft."

I'd just tap it in as it doesn't need to stick out so far as it doesn't drive the Optispark distributer as it is absent in the 1996-2002 L31 350 application.

On the L31 that dowel is just used to correctly align the camshaft sprocket on the end of the camshaft.

07-08-2016 08:54 PM
Calderone Here's the stock L31 Camshaft (Short pin)
and the Hotcam with the Long pin.

i cannot find the correct length for the L31 pin
and the stock casm is sold.

Should i cut it or press the dowel in?
07-08-2016 04:31 PM
Calderone Thanks, we'll leave them out then.
07-08-2016 04:30 PM
BuzzLOL Most stock rods are press in, but some high performance engines came stock with floating pins...

Using the rings with a press in rod might push the piston to one side if pin not pressed into the exact correct position...
07-08-2016 03:49 PM
Calderone So stock rods are non floating type, right?
I have never worked with aftermarket floating rods.
So if we use them it's overkill?
Thanks again Buzz
07-08-2016 03:47 PM
BuzzLOL Tight press in rods don't need the snap rings in the pistons... they just supply them in case you have the loose fit floating pin rods...
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