Pontiac 400 Exhaust maifold gasket

[StealthBird]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 68 Vert</div><div class="ubbcode-body">Don't forget the '71-'72 455 HO round port engines. </div></div>

Yes, and I forgot the 1971-1972 455 H.O.'s.

[jasonL78]

Guys what gaskets are you using on these 400 TA manifolds. I changed them out with stock looking fel-pro and the driver side is still leaking. I removed the manifold today cleaned up the face of manifold. Using a straight edge it looks like the manifold is warped. The center port is lower than they the two outside ports. So I tried to get them square to each other. But after I installed the manifold it still is leaking on the center port. So do they make a thicker gasket for these pontiac manifolds?