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Old 12-03-2004, 01:38 AM   #1
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Default Header Theory

After some good reading, I want Headers. Granted, a cam/valvetrain, and matched heads are what an L27 needs to make real power, Headers will help a lot on a larger engine like ours. Pre Series II manifolds are very far from headers btw...

But there'* actually A LOT of great info down here. There are even parts to build your own, and lots of info on how to go about design. It also shows what'* bad about a lot of common designs by big manufactures.


http://www.headersbyed.com/index.htm

http://www.headerdesign.com/index.asp

http://www.thedirtforum.com/headercalc.htm
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Old 12-03-2004, 01:41 AM   #2
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Cool! What I want to do is buy me a new engine later on down the road, have them install my current manifolds and ceramic coat the new ones and get them wrapped and then have them installed.
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Old 12-03-2004, 02:09 AM   #3
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Quote:
Originally Posted by CmptrNerd
Cool! What I want to do is buy me a new engine later on down the road, have them install my current manifolds and ceramic coat the new ones and get them wrapped and then have them installed.
You could take your current manifolds, use the flanges, or template new ones up, and make your own Header set too. If you have access to welding, you could gain a lot more power, and efficiency. Good scavenging headers will decrease underhood temps on their own too.
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Old 12-03-2004, 03:10 AM   #4
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No I suck at cars so I couldnt fab anything up myself.
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Old 12-03-2004, 10:58 AM   #5
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i hear ya jason, i want headers too, every time i look at the manifolds i wonder how much theyre holdin my car back from hp and possible pulley size
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Old 12-03-2004, 02:20 PM   #6
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Quote:
Originally Posted by jgs11
i hear ya jason, i want headers too, every time i look at the manifolds i wonder how much theyre holdin my car back from hp and possible pulley size
Series 2 L67 is more restrained by the manifolds than a series 1. Headers are probably the best thing to do for a car, helps increase flow and reduce knock.
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Old 12-03-2004, 11:41 PM   #7
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Quote:
Originally Posted by smellbird
Series 2 L67 is more restrained by the manifolds than a series 1. Headers are probably the best thing to do for a car, helps increase flow and reduce knock.
100% correct. Those castings are nasty in the ones i've been shown. Series 1 is good for a manifold, but far from a nicely tuned set of tubes. Just wish we had better price options too. Headers for your Run of hte mill 350 in most older cars start between $100 and $150. Not the best, but better then nothing.
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