Originally Posted By cudadoug
Curious: What altitude is that track??

Generally speaking at 0 deck flat top piston with a 79.5 cc chamber is right at 11:1, depending on head gasket. That said, to be a 12.6 with milled 906's...is a very generous GUESS-timate.


Track altitude is 700ft, my shop where I measured cyl pressure is 600ft.

Have no opinion on comp ratio, just referring to Hughes etimation...


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