high compression egge pistons for 273

Bossanova5 said

What about the head gaskets that are available from Cometic?
Don't they address the bore size issue, and the thickness issues found using the 318 head gaskets on a 273 Commando?

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That's a good question and it's not just those two things. It's also the actual shape of the gasket bores. On the 273, they are not round. They follow the shape more closely of the combustion chamber. Like this.