Originally Posted by Gumby
What series copper alloy are you talking about? Either way you make good safety points. In the past did you use a stock gasket for your tubular headers? Personally I plan to use a regular gasket since I doubt the gap between the two ports will cause much issue.
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Not sure what copper alloy specifically, to be perfectly honest. But once annealed it was 'dead soft' for sure.
I have used custom header gaskets (1.9 and 2.2 type) on all performance applications. I used to have them made when I owned C & R. They have the divider between cyl #2 and #3. Not doing so skewed the ability to jet each cylinder correctly. Not sure it's much of an issue on a street engine, but for racing it's rather important. Plus not having the metal port 'surround' means I can port the gaskets (they were graphite with metal core) to match the head's port shape. Again, very critical for racing, as stock gaskets hang into the intake port tract!
Bob