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Old 12-27-2012, 07:32 PM
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Thinking outloud

What I'm seeing is the 383HT's pistons give a 9.1:1 CR w/a 0.028" thickness HG and the Vortec chamber size. So that takes the block being built w/a zero deck out of the equation, I think.

Chevy shoots for a 9.0" stack of parts for SBC engines. Using a 9.025" block deck height, 3.8" stroke, and 5.7" rods, the piston CH would need to be 1.4” for the stack to equal 9”: 1.9 + 5.7 + 1.4 = 9.0

It appears the HG is 0.028" thick, and we know the CR is advertised as 9.1:1.

A 0.028" gasket using the numbers above will give a quench distance of 0.053". To bring the quench down to 0.040" would require a piston CH of about 1.413" (or a HG thickness of 0.015").

Approximate dish volume:
Using the quench distance of 0.053", a piston dish size of 22cc would be about right for a 9.1:1 CR.
Quench of 0.040" = 24cc dish.

383HT specs
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