Source For Big Bore \6 Head Gaskets

Charrlie_S said
The gaskets I have in stock are the OEM steel shim gasket (part number 2843182). They do mic between 3.510-3.515. I have my doubts about either the Felpro or the OEM steel gasket holding up to 13-1 and nitrous. I would opt for a solid copper gasket with "O" ring in the block and/or head.
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Well I plan to sneak up on the nitrous so if I would blow a gasket it probably wouldn't be a catastrophic failure since both the block & head are cast iron.

My labor is free so the difference in cost would just be a gasket set.

Is there a source for copper gaskets for the \6?