High velocity header collectors, are they worth it?

Greg Hill · 07-30-2010, 04:43 PM

There are a couple of things I have observed over the years about headers on my car that may or may not be true for others. #1 Is that a dyno is not the place to test headers. Mike Keown told me years ago a bigger header will make more power on the dyno but won't go down the race track like it shows on the dyno and that has been my experience. #2 is what I heard from a really good header builder and that was that the first 8 inches of the primary tubes were the most important part of a header and the size of the first step should match the port size. These are just my experiences on my car and probably aren't relevant for every one else.

07-30-2010, 04:43 PM	#15
Greg Hill VIP Member Join Date: May 2006 Location: Louisville , KY Posts: 1,995 Likes: 68 Liked 279 Times in 68 Posts	Re: High velocity header collectors, are they worth it? There are a couple of things I have observed over the years about headers on my car that may or may not be true for others. #1 Is that a dyno is not the place to test headers. Mike Keown told me years ago a bigger header will make more power on the dyno but won't go down the race track like it shows on the dyno and that has been my experience. #2 is what I heard from a really good header builder and that was that the first 8 inches of the primary tubes were the most important part of a header and the size of the first step should match the port size. These are just my experiences on my car and probably aren't relevant for every one else. __________________ Greg Hill 4171 STK