Quote:
Originally Posted by Formulabruce
So basically 2.5 to 2.75 ABOVE real static CR..
sounds like "stock" to me !
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No sir, it's 1.5 points above the "advertised" ratio. So most of your performance pontiacs that advertise 10.75:1 are allowed up to 12.25:1 compression.
That's why you are seeing your HO's and SD's peak at 9.9:1, because you start with an advertised that is so low to begin with. The increase is uniform accross the board, so as far as "stock vs stock" comparison, it's still about as real as it gets considering it's been 40+ years.