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Original Message
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| RE: what to look for... |
| By Mike McQuesten - 10/14/2002 10:57:45 PM; IP 65.176.104.228 |
Most heads cast from '66 on had a boss that allowed for the new style uni-body exhaust manifold. It's a very obvious thing to see. You can hope to find a set where those bosses are already drilled/tapped to accept the manifolds but most importantly is just that the bosses be there so that you can drill/tap them if you want to use the original manifolds which as I opinionated that I don't think you should.
Standard FE heads for full framed pass. cars ran a straight up/down vertical bolt pattern thus just eight holes. The uni-body heads for '66-'69 390s ran a 14 bolt arrangement. I still don't have a scanner to offer a picture for you. There were four holes in the first & last exhaust ports, two vertical & two somewhat horizontal. The middle two ports ran three holes, one on top and two horizontal. There's been a lot written about this and maybe someone can scan a shot for you.
Now CJ/C8OE-N heads ran 16 bolt holes that allowed you all the flexibility you needed. You could run any exhaust manfold, i.e., standard log, CJ, GT, HP short/long. Anything as long as you had engine bay room to run whatever.
Again, just run good headers that are specifically designed for your heads and your Mustang. Good luck getting back to what should be powering your '67 GT. |
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