Thread: Max Dynamic Compression Ratio?

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Originally posted by MainCap
Thanks for all the advice.

I'm trying to get there from here but piston selection seems pretty thin when using 64cc Vortec heads.

As an aside, I was just reading a CHP article posted on CompCams site regarding an equivelent build in both a 355 and 383 intended to run on 87 octane. They chose pistons with a static CR of 9.75:1! Obtained over 500hp as well on 87 Octane. Interesting...

Anyway, with my intended cam the intake closing is just past 60 degrees ABDC. With a 5.7" rod my dynamic CR would be ~7.93 with 18cc D-cup pistons. A 28cc piston yields a dynamic CR of ~7.25:1. These two pistons yield a static CR of ~9.55/8.7:1 respectively, using an .040 quench distance.

Wish I could find a D-Cup stroker piston in the 22-24cc range as I'd like to hit a static CR of ~9.0:1...

You never said how much money you wanted to spend.These pistons might be over -kill for you but I think they are what you are looking for.JE part #131636.Yes they are exspensive.Check out there web site www.jepistons.com.