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Match port and polish?? 

 

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Posted: Mon Nov 07, 2005 11:16 am 
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Shouldn't tuned extractors not require that? As the length of the pipes should ensure the gas flow is correct and unimpeeded.

 

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Posted: Mon Nov 07, 2005 11:31 am 
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blackjack_original wrote:
Yeah, because of back pressure... sort of. as it was explained to me... when you have the lip, it reduces the pulses of the back pressure... if that makes sense... you can still have overall back pressure from the exhaust, but the lip reduces the pulse when one of the other cylinders pushes out gas out... understand what i'm trying to say? This is the reason why most stock headers and presumably aftermarket headers are bigger in diamater than the ports in the head, to create that lip.


I understand what your saying. I've been re-educated by you and tickford_6.

 

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Posted: Mon Nov 07, 2005 10:14 pm 
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here are some links that might interest a few people.
also might help put a few myths to rest

http://www.ssheaders.com/header.htm

http://superchevy.com/technical/engines ... 05phr_exh/

be sure too read both pages on the super chevy one

not exactly porting realated. but any way

 

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Posted: Mon Nov 07, 2005 10:54 pm 
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There used to be (many years ago -before I was around), a compay that made extractors that were that anti reversion the specially put a lip in the head mounting place of the extractors for it.

 

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