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Old 06-06-2022, 12:23 PM
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kingbuzzo kingbuzzo is offline
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Default 74 T/A header options...

Hi Fellas:

It is my understanding that D port headers won't fit on a 6x round port head.

What economical options would you recommend for someone going completely broke getting their "new" trans am on the road.

Thanks!

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Old 06-06-2022, 12:28 PM
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All versions of the 6X head are D-port.

Round port heads are quite rare. They only came on special Ram Air, High Output or Super Duty engines from 1968 - 1974. Probably 99.999% of all Pontiac heads are D-port.

Thread showing the differences between round and D-port heads:

http://forums.maxperformanceinc.com/...d.php?t=636309

Finding headers for your car should be easy, they’re available from several different manufacturers.

With that said most will be dragging the ground and become a headache, some Ram Air exhaust manifolds might be a better option if you’re not building an all out race engine.

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Old 06-06-2022, 12:32 PM
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Thanks for the clarification - always learning...

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Old 06-06-2022, 12:35 PM
poncho-mike poncho-mike is offline
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At one time, H-O Specialties made a slick set of headers for Firebirds that worked well. They offered far better ground clearance than any other header manufactured at the time.

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Old 06-06-2022, 12:39 PM
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Once in a blue moon you’ll see those H-O Racing Tri-Y D-port headers come up for sale somewhere. They haven’t been produced for a few decades I’m thinking.

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Old 06-06-2022, 12:44 PM
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Oh ok - I'll look into that if I can't get these old ones to match up.

Thanks sir

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Old 06-06-2022, 08:56 PM
cdnroundport cdnroundport is offline
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I have a set of roundport ones I will dig and and get a pic They we’re on a 76 Fire-Am inspired car I owned

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Old 06-06-2022, 10:20 PM
ponchonlefty ponchonlefty is offline
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if you would like to see how some headers fit. look for spsteve channel on youtube. he installs a set on a f body i think theyre hookers brand . hope this will help.

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Old 06-06-2022, 11:49 PM
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Thanks guys.

I purchased a used 6x head and it is being shipped here.

Hoping they are D port as that would save me some grief.

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Old 06-07-2022, 12:11 AM
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Quote:
Originally Posted by kingbuzzo View Post
Thanks guys.

I purchased a used 6x head and it is being shipped here.

Hoping they are D port as that would save me some grief.
Worry not.

As already stated above all 6X heads are D-port.

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Old 06-07-2022, 10:02 AM
78w72 78w72 is offline
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yes all 6x heads are D port....

the best value to quality headers for 2nd gens cars are the hedman 28150. they fit very good & work with a manual trans & are priced decent compared to most other brands. ive had a set on a 78 with a 4 speed for going on 12 years now & still use the supplied fiber gaskets with zero leaks. they have very good ground clearance too.

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Old 06-07-2022, 12:09 PM
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Ok great - I'll keep these in mind if I can't recycle the old ones...thx

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Old 06-07-2022, 03:52 PM
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I have hookers on my '74. First you want to do with any 3 bolt flange header is cut off those flanges. Weld on a set of two bolt gasketless flanges. So now there is no flange to hit the floorboard on the driverside or scrape the ground on the pass side! https://www.summitracing.com/parts/flo-15925 this is what I used!

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Old 06-07-2022, 04:52 PM
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I like the sounds of that...thx

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Old 06-07-2022, 05:00 PM
78w72 78w72 is offline
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another benefit of the hedmans, they have that ball/socket connector & the flanges rotate freely for clearance.

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