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 Trouble free GTO headers?
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CRM318
Tribal Scout

USA
30 Posts

Posted - 28 Jan 2014 :  08:38:25 AM  Show Profile  Reply with Quote
I will be trying to buy a set of headers for my 1970 GTO in the next few days and after reading the forum posts, It seems that no one is pleased with the fitment of any header brand. Has anyone bought a set of headers that went in without denting, cutting or any modification?

1970 Pontiac GTO, Atoll Blue, 400, TH400, 3.73 Safe T Track

GtoGuy32
Cochise

USA
842 Posts

Posted - 28 Jan 2014 :  11:28:25 AM  Show Profile  Reply with Quote
Doug's makes a good set that fit great. I have a 69 GTO, 4 speed, with round port heads.

Bought the bare steel and jet coated them.....fits like a glove.

-Dave
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CRM318
Tribal Scout

USA
30 Posts

Posted - 28 Jan 2014 :  5:05:27 PM  Show Profile  Reply with Quote
I ended up going with the Hooker 4901. Do you need the angled oil filter to use headers?

1970 Pontiac GTO, Atoll Blue, 400, TH400, 3.73 Safe T Track
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GtoGuy32
Cochise

USA
842 Posts

Posted - 28 Jan 2014 :  8:10:31 PM  Show Profile  Reply with Quote
Is that the super comp header or regular? I had regular hookers on my D-port headed 400 with 4 speed and did not use an angled oil filter adapter.

Typically hookers are tough to install, but worth it once you get them in there. You might have a few spots that might get dinged up while going in.
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CRM318
Tribal Scout

USA
30 Posts

Posted - 20 Mar 2014 :  4:14:32 PM  Show Profile  Reply with Quote
They are the Super Comp. The only thing that makes me nervous is the proportoning valve. Did you have a problem with that?

1970 Pontiac GTO, Atoll Blue, 400, TH400, 3.73 Safe T Track
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GtoGuy32
Cochise

USA
842 Posts

Posted - 20 Mar 2014 :  7:57:00 PM  Show Profile  Reply with Quote
Yes, on my 69 and my buddy's 67 GTO, the proportioning valve is right up against the header. I even have very tight clearance at my proportioning valve with my Doug's headers now.

You can do a few things:

1. Put a dent in the header tube that would be touching. Do you have ceramic or jet hot coating? If so, careful, as you will likely damage the coating in that spot.
2. Try to relocate the valve if possible
3. Maybe put a wrap on the header in this location I you have clearance.

I also have solid engine mounts in my car. This keeps the engine from rocking and abrading the header tube on the valve. That helped fix my issue. Brake fluid had a pretty high boiling temp, do you will prob be okay with it near the valve.
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PontiacMatt
Many Ponies

USA
1410 Posts

Posted - 29 May 2014 :  1:43:17 PM  Show Profile  Reply with Quote
For what it's worth, i relocated my proportioning valve on my 72 Lemans... I was uneasy about the close proximity, if the fluid actually did reach a boiling temp/point, it could put air in the system. not whatcha want.

*72' Pontiac Lemans* - Work in Progress
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Blued and Painted
Chief PONTIAC

USA
3409 Posts

Posted - 29 May 2014 :  3:07:07 PM  Show Profile  Reply with Quote
did you buy a kit or fab it up?


Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.
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