what headers work/fit best? - Pontiac GTO Forum
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post #1 of 7 (permalink) Old 06-15-2012, 02:42 PM Thread Starter
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what headers work/fit best?

just found out that my doug's headers i bought 2 years ago will not fit my 67 lemans, so i gotta find some replacements. i read alot of posts and it seems like a bunch of ya'll are running hedmans and ram air manifolds, and i read that 3 tube headers are much easier than 4 tubes.

i would like to know what works well, and what to order, was looking for something ceramic coated. any help woud be greatly appriciated
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post #2 of 7 (permalink) Old 06-15-2012, 05:24 PM
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For ease of installation and fit, nothing beats the repro ram air manifolds. If you really want the extra performance of headers, I've heard good things about mad dog, but I have no direct experience with them. I've got round port Doug's on my 69.

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post #3 of 7 (permalink) Old 06-16-2012, 11:35 AM
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I've run the old Hedmanns for decades. They work well, but still require blacksmithing. They also leak when I forget to tighten the bolts routinely---- and then they burn out the gaskets. The set on my '65 was made in the '70's and they're ugly, but working fine. Best bet: factory HO/Ram Air cast. No leaks, no fuss, mo muss, and a clean install. They work well, too.
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post #4 of 7 (permalink) Old 06-17-2012, 10:06 PM
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Maybe it is because I am not as tolerant as I was 20 years ago, but despise headers on a street car (unless someone else is working on the car).

There is a dyno report out there showing headers vs Ram Air manifolds on a 400hp Pontiac, and was less than 10hp difference. You can get the aftermarket ram airs for $400 or less, so even cheaper than a "good" set of headers.
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post #5 of 7 (permalink) Old 08-03-2012, 11:50 PM
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how vcan i tell the difference on a set of headers for a 4 spead and an automatic. I have a 1966 gto with a 400 engine and an M20 4 spd
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post #6 of 7 (permalink) Old 08-04-2012, 06:01 AM
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I used the Headman's on my 68 Tempest 350 and have had no problems with them leaking. I did nave to "persuade" them a little on the driver's side to avoid touching the frame. I opted for their ceramic coated ones and they look very nice. I don't have too many miles on them yet, so only time will tell. I did replace an older set of Headman's with these and they performed well over the 20 years they were on the car. Here's are a few photos of the new ceramic ones...
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post #7 of 7 (permalink) Old 08-04-2012, 10:34 AM
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RAM AIR MANIFOLDS ! where practical....check out Ram Air restorations web site....IMHO. Eric

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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO General Discussion

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