I'm getting the header ceramic coated so I'm going to need gaskets. Copper ones for sure. Trying to figure out if I go round or square port? The header is round and the head is square. Edelbrock calls for a 1.5" X 1.5" square regular material type gasket. I just can't find that exact measurement in copper. There's 1.5 x 1.46, I assume that's close enough. Thought?

 

Here goes a similar discussion.
https://www.thirdgen.org/forums/exha...kets-what.html

 

Just use regular Felpro or something like that, but whatever you do make sure you Elongate the holes , trace it with a marker and make sure it matches the heads, cause you can blow out header gaskets pretty easily. Plus it will flow better if you elongate the gasket openings.