Size of headers
Thread Starter
12 Second Club
Joined: Mar 2005
Posts: 334
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From: Georgia
Size of headers I haven't posted in forever but I have 1 3/4 headers and was wondering if a larger header size would make a difference. Like 1 7/8 or 2 in. Car has heads and cam with bolt on. Dynoed 460 rwhp. Thanks
Oh boy...here we go. There is a huge debate on this, some say yeh, some say no (for example https://ls1tech.com/forums/dynamomet...8-headers.html)
My opinion is (and I have SE 1 7/8") gain a little on top, give up a little on bottom. If nitrous in in the formula then definitely yes.
My opinion is (and I have SE 1 7/8") gain a little on top, give up a little on bottom. If nitrous in in the formula then definitely yes.
What HCI2000SS said...90+% of the post you will see say a 10+ gain.
My buddy has TS 1 7/8 on a true "Stock internal" 6-speed and that crazy thing runs 11.1 and 60's in the 1.45
so they are definitely working for him. I personally haven't tested the difference back to back. Most will argue with me but on motor my car feels a little lazy until about 4000, but I am a stalled auto with a "too tight" 3600.
Now on the juice, that is a different story.
My buddy has TS 1 7/8 on a true "Stock internal" 6-speed and that crazy thing runs 11.1 and 60's in the 1.45
so they are definitely working for him. I personally haven't tested the difference back to back. Most will argue with me but on motor my car feels a little lazy until about 4000, but I am a stalled auto with a "too tight" 3600.Now on the juice, that is a different story.
You may pick up a few with 1 7/8 "8-12" rwhp, it would benefit even more if you went on the bottle, but I would stay away from the 2" unless you plan on a blower in the future, they love to get the air out.
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The main question that needs to be asked here is what heads do you have and what is the exhaust valve size? That is going to dictate whether the larger headers are going to make a difference or not. Also, a lot has to do with the duration of the cam.
Per Brian Tooley, heads like AFR and my AI Dart/RHS heads that have super high exhaust flow numbers and bigger exhaust valves, back to back testing showed they did better with the 1 3/4" headers. On setups with heads that had smaller exhaust valves and not such high exhaust flow numbers, the 1 7/8" headers picked up power every time over 1 3/4" headers.
Per Brian Tooley, heads like AFR and my AI Dart/RHS heads that have super high exhaust flow numbers and bigger exhaust valves, back to back testing showed they did better with the 1 3/4" headers. On setups with heads that had smaller exhaust valves and not such high exhaust flow numbers, the 1 7/8" headers picked up power every time over 1 3/4" headers.
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