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<blockquote data-quote="shurur" data-source="post: 15928349" data-attributes="member: 113850"><p>From what I understand, porting the heads does little.</p><p>You need to open up the exhaust (seat) valve diameter to that of the intake..I have the info somewhere.....</p><p></p><p>found it:</p><p>-Open the seat IDs to 90% of the <a href="http://motors.shop.ebay.com/i.html?_nkw=intake+valve" target="_blank">intake valve</a> OP and 85% of the exh valve OD.</p><p><a href="http://forums.corral.net/forums/svt-dohc/1507401-recommended-c-head-work.html" target="_blank">http://forums.corral.net/forums/svt-dohc/1507401-recommended-c-head-work.html</a></p><p></p><p>I think porting the intake helps little for OEM RPMs..anything above OEM RPMs needs a SRI.</p><p>but I have gotten conflicting info on this lately.</p><p></p><p>NA SVT is the one to get to chime in on this thread.</p></blockquote><p></p>
[QUOTE="shurur, post: 15928349, member: 113850"] From what I understand, porting the heads does little. You need to open up the exhaust (seat) valve diameter to that of the intake..I have the info somewhere..... found it: -Open the seat IDs to 90% of the [URL='http://motors.shop.ebay.com/i.html?_nkw=intake+valve']intake valve[/URL] OP and 85% of the exh valve OD. [URL]http://forums.corral.net/forums/svt-dohc/1507401-recommended-c-head-work.html[/URL] I think porting the intake helps little for OEM RPMs..anything above OEM RPMs needs a SRI. but I have gotten conflicting info on this lately. NA SVT is the one to get to chime in on this thread. [/QUOTE]
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