Dyno a 7.5:1 400? Sure, why not?

IQ52 said

You can change pistons if ya want to, nothing wrong with that. But this will give you an idea of what you can get if you decide to keep what you have.

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I agree, but... That's the half of it for me. A piston change is not in the budget at all. I have to work with what I have. A very good running 400 & a 727 in a Duster.