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Old 02-25-2003, 04:00 PM
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Post 1967 gto cylinder heads

Can anyone please help! I have searched your archive base and also checked several other websites for a answer to no avail.
I recently purchased a 1967 gto to restore.
This car is all original with 78,000 miles
It has the 400 ys block motor with a his/hers
auto trans.My question is about the heads.
The number cast into them is 670. How do these
stack up to the other originals. When I rebuild
I may go with aftermarket heads. Any feedback would be greatly appreciated. thanx

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Old 02-25-2003, 04:27 PM
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These are very good closed chamber (52cc), high comp heads that produce a lot of hp. Pump gas may be your biggest problem.
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Old 02-25-2003, 05:17 PM
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Sell them to me theyre not worth messin with.
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Old 02-25-2003, 05:45 PM
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PONCHO POWER ALL THE WAY MAN
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Old 03-01-2003, 05:37 AM
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The heads are original for the engine. The 670 are excellent heads and have 72cc chambers and are a closed chamber design. 67 was the only years for closed chamber heads as 68 and up were all open chambers. The stock engine has a factory compression ratio of 10.75:1 and if it's a ram air version it'll have a 744 camshaft,if it's the standard 400 it'll have an 068 camshaft (4spd) or 067 cam if it's an automatic. Either way the heads are excellent heads for whatever you want to do with the engine. I have a pair of 670's on my 71 GTO and are very happy with them. Stay with the 670's or if you decide to go aftermarket then go with a set of Edelbrocks but hold on to the ones you have.
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Old 03-01-2003, 08:53 AM
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Well as you may or may not know im a big aftermarket fan....except in this case. The Edelbrock heads are FAR supirior to any head pontiac ever made even the ram air IV's, but they are like 1600 dollars and theyre not worth that much more power until they get ported. The 670's are a 72cc chamber not a 52cc chamber. From what i can gather they are a good factory head but not the best but will probably suit you fine for what ever your going to do. I have em on my 67 and it ran strong till it spun a bearing...ooops. But you can have some port work done to em and youll never complain.
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