LS6 Intake question.
Thread Starter
Racer
Joined: Apr 2019
Posts: 305
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From: Central PA
2024 C5of the Year Finalist - Unmodified
LS6 Intake question.
I'm sure its been covered on here, but I couldn't find it. Do all 2001 and up base models have an LS6 intake, or only later models made that year? Also, can you tell WITHOUT pulling the intake off which one the car has?
I don't pick up my car until mid February, but already looking at some upgrades I want to do.
Thank you!!
I don't pick up my car until mid February, but already looking at some upgrades I want to do.
Thank you!!
Race Director
Joined: Oct 2004
Posts: 12,861
Likes: 4,663
I'm sure its been covered on here, but I couldn't find it. Do all 2001 and up base models have an LS6 intake, or only later models made that year? Also, can you tell WITHOUT pulling the intake off which one the car has?
I don't pick up my car until mid February, but already looking at some upgrades I want to do.
Thank you!!
I don't pick up my car until mid February, but already looking at some upgrades I want to do.
Thank you!!
.
Joined: Apr 2013
Posts: 5,025
Likes: 1,151
From: Oregon
St. Jude Donor '14-'15-'16-'17-'18-'19-'20-'21-'22-'23
I can't remember if the part # is visible, or not. BUT-The LS1 intake has a different part# than the LS6 intake. To answer your question, YES, all '01-up C5s have the LS6 intake. It is the primary reason the '01-up LS1s jumped from a rated 345hp to 350hp. The LS6 intake has virtually no room under it between the valley cover and the bottom of the plenum. The increase in plenum size is the primary reason hp increased. It is mainly at higher rpm, but it is there. The LS1 intake has a slightly recessed area on its bottom side. Hope this helps......
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All 2001+ C5s have the LS6 intake. 
Drifting
Joined: Sep 2009
Posts: 1,862
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From: Prescott, Arizona
If you put the LS 6 intake on an earlier car you will have to deal with the coolant air bleed pipelines under the manifold. Without modification the LS 6 manifold and the earlier coolant air bleed pipelines interfere. For whatever reason 2001 and later cars have the rear head coolant air bleed ports blocked off, apparently to accommodate the LS 6 manifold. and only the front coolant air bleed pipes connected.
There are reports that the later coolant air bleed system does not adequately allow air out of the rear of the heads and may contribute to rear cylinder failures when pushed hard on track.
Maybe old wives tales, but many of us with 2001 and later cars have re connected the rear head coolant air bleed ports as a precaution.
There are reports that the later coolant air bleed system does not adequately allow air out of the rear of the heads and may contribute to rear cylinder failures when pushed hard on track.
Maybe old wives tales, but many of us with 2001 and later cars have re connected the rear head coolant air bleed ports as a precaution.
Race Director
Joined: Oct 2004
Posts: 12,861
Likes: 4,663
If you put the LS 6 intake on an earlier car you will have to deal with the coolant air bleed pipelines under the manifold. Without modification the LS 6 manifold and the earlier coolant air bleed pipelines interfere. For whatever reason 2001 and later cars have the rear head coolant air bleed ports blocked off, apparently to accommodate the LS 6 manifold. and only the front coolant air bleed pipes connected.
There are reports that the later coolant air bleed system does not adequately allow air out of the rear of the heads and may contribute to rear cylinder failures when pushed hard on track.
Maybe old wives tales, but many of us with 2001 and later cars have re connected the rear head coolant air bleed ports as a precaution.
There are reports that the later coolant air bleed system does not adequately allow air out of the rear of the heads and may contribute to rear cylinder failures when pushed hard on track.
Maybe old wives tales, but many of us with 2001 and later cars have re connected the rear head coolant air bleed ports as a precaution.
Last edited by grinder11; Jan 28, 2021 at 09:17 AM.
