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Generation IV Internal Engine 2005-2014 LS2 | LS3 | LS7 | L92 | LS9

L92 flow results with manifold.

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Old Nov 4, 2006 | 04:14 PM
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They look like a one piece intake. I don't see how or where you could separate these manifolds.

Richard
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Old Nov 4, 2006 | 05:01 PM
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Originally Posted by 2c5s
Marginal......... looks like the intake flow numbers equal cathedral port numbers with no intake. My L92 and L76 are ordered.

I think there's going to be a bunch cathedral port door stops laying around in the near future.
Bout 20 cfm, I would consider that marginal I guess. Far from "drastic", but how can you argue over something with no set limit?
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Old Nov 4, 2006 | 07:21 PM
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Originally Posted by Richard@WCCH
They look like a one piece intake. I don't see how or where you could separate these manifolds.

Richard
flip the manifold over and youll find 2 metal rivets, those arent there for show
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Old Nov 4, 2006 | 10:06 PM
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this just made my decision of choosing between an L76 manifold or an L92 carb style manifold even more difficult.

323 cfm through a manifold

do you know how much did the 4.1" bore help over a 4" bore?
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Old Nov 4, 2006 | 10:10 PM
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Originally Posted by Wnts2Go10O
flip the manifold over and youll find 2 metal rivets, those arent there for show
I don't see a separable seam around the manifold like the LS7s. Where is the intake supposed to split?

Richard
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Old Nov 4, 2006 | 10:49 PM
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Originally Posted by Richard@WCCH
I don't see a separable seam around the manifold like the LS7s. Where is the intake supposed to split?

Richard
well lemme go look at it more closely.
Edit: well thats weird as hell. theres 2 posts in the intake that make it look lik a 2 piece. it doesnt seem like the intake needs them for rigidity but yea there is no seem
Last edited by Wnts2Go10O; Nov 4, 2006 at 10:59 PM.
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Old Nov 4, 2006 | 10:54 PM
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Those are some nice numbers.
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Old Nov 4, 2006 | 11:31 PM
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Originally Posted by Wnts2Go10O
well lemme go look at it more closely.
Edit: well thats weird as hell. theres 2 posts in the intake that make it look lik a 2 piece. it doesnt seem like the intake needs them for rigidity but yea there is no seem
Methinks GM might have put the 2 posts in to hold all the boost pressure!!!

Richard
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Old Nov 6, 2006 | 12:27 AM
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Will these heads/intake work on a ls1(5.7) block. The intake size lookes to be on the big side. Has this been done before?
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Old Nov 6, 2006 | 01:05 AM
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No, they need at least a 4.0" bore.

Zigroid,

A well ported single plane should probably do BETTER than that!!

Bret
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Old Nov 7, 2006 | 05:13 PM
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Originally Posted by zigroid

do you know how much did the 4.1" bore help over a 4" bore?
I'd like to know this as well....... im sure some of our head gurus (maybe even Mamo himself) could answer this for us.
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Old Nov 9, 2006 | 09:53 AM
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How much is it for your head porting/clean up work on these heads?
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Old Nov 9, 2006 | 10:19 AM
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Originally Posted by Wnts2Go10O
well lemme go look at it more closely.
Edit: well thats weird as hell. theres 2 posts in the intake that make it look lik a 2 piece. it doesnt seem like the intake needs them for rigidity but yea there is no seem

the floor of the intake vibrates without it, and it can make the intake fail.

i believe i read that in Will Handzel's book "How to Build High-Performance Chevy Ls1/Ls6 Engines"... but it could have been another book.. i forget...
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Old Nov 9, 2006 | 10:45 AM
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Originally Posted by MrDude_1
the floor of the intake vibrates without it, and it can make the intake fail.

i believe i read that in Will Handzel's book "How to Build High-Performance Chevy Ls1/Ls6 Engines"... but it could have been another book.. i forget...
we got ourselves a booknerd.
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Old Nov 9, 2006 | 01:12 PM
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Originally Posted by MrDude_1
the floor of the intake vibrates without it, and it can make the intake fail.

i believe i read that in Will Handzel's book "How to Build High-Performance Chevy Ls1/Ls6 Engines"... but it could have been another book.. i forget...
on a ls1 intake i had i drilled out the 3 pillars and cut out the bottom, the polished the runners and any rough surfaces and epoxied evrything back together, never broke or leaked, even made over 550 rwhp with a turbo
so i dont think it will affect it to much if they removed, but then again
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