Porting out stock LS6 headers
Burning Brakes
Joined: Sep 2002
Posts: 1,117
Likes: 1
From: Cedar Falls Iowa
Ported and polished stage three here. Don't remember the flow #s exactly but were close to 320. They were done by hand by a guy who does alot of NHRA cars and been doing them for about 15 years. Also has done many LS1's in the past.
Melting Slicks
Joined: Mar 2003
Posts: 2,744
Likes: 9
From: FL
Cruise-In VI Veteran
Originally Posted by 1 Nasty Z
Ported and polished stage three here. Don't remember the flow #s exactly but were close to 320. They were done by hand by a guy who does alot of NHRA cars and been doing them for about 15 years. Also has done many LS1's in the past.
I think he was referring to the manifolds (headers)..
I guess you could do the manifolds.. but I dont' see it giving you much gain.. I have heard of doing it before on other cars.
Thread Starter
Pro
Joined: Jan 2005
Posts: 559
Likes: 0
From: Plano TX
Originally Posted by Steve92LT1
Heads or headers?
I think he was referring to the manifolds (headers)..
I guess you could do the manifolds.. but I dont' see it giving you much gain.. I have heard of doing it before on other cars.
I think he was referring to the manifolds (headers)..
I guess you could do the manifolds.. but I dont' see it giving you much gain.. I have heard of doing it before on other cars.
--Marc
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
Car Craft recently did a series of LS1 articles. With headers, they only picked up a few HP over the stock Vette manifolds which are a Tri-Y design. They basically stated headers weren't worth the money. However, I noticed a great gain not only on the dyno but also SOTP after my header installation. If you are going this route, the later case iron manifold is the way to go. I have a friend who is contemplating this same thing, and then coating them.
Instructor
Joined: Nov 2004
Posts: 112
Likes: 0
no manifold or mid length header will give you what a good set of long tubes will. manifolds are NOT fun to put on and you will feel no gain, after porting the stock manifolds.... not even worth thinking about. save your pennies and get a good set of LG's 
mike
mike
Safety Car
Joined: Dec 1999
Posts: 4,148
Likes: 5
From: Roxbury NJ
Originally Posted by Lithium
anyone done this?
--Marc
--Marc
I've thought about it, I'd love to try it, but the cost is prohibitive. To do it right, you'll want an "extrude hone" job, and that ain't cheap. I think they get around $300 per manifold.
I've had lots of cars with headers, and they're definitely not the best choice for everyone in every situation. I really don't want them on my C5. For a weekend track car, no problem, but for the street they're a compromise.
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