[Scarebird]

Originally Posted by lust4speed

I wouldn't consider going with a cast iron manifold with aluminum heads, and would definitely pick a dual plane intake manifold. Every Edelbrock Performer RPM manifold needs to be milled about .060" on each side to have it fit properly, and that is going to add another $80 to the manifold cost.

It looks like none of our Pontiac suppliers are carrying the Crosswind style manifold which is a clone of the RPM (but without the exhaust crossover). I remember reading that they were a nice piece, but wondering why it now has to be ordered on ebay? I did a quick check and the dual plane clone for the RPM isn't on any of our supplier's sites.

Also, I guess you could say that Pontiac manifolds were the original "air-gap" design since the manifold has always been divorced from the valley area.

I have a Crosswind for sale if that is what is desired by the OP. Not sure on the Performer as the crossover definitely says Holley.