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Old 08-24-2008, 02:33 PM
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Originally Posted by oldbogie
You really need better pistons.

The problem with circular dish pistons is a lack of squish/quench in the combustion space.

a fundamental engineering flaw in the combustion chamber because of the piston crown shape.

flat portion of the head as close as reasonable somewhere in the zone of .050 to .060 inch including the distance the piston sits below the head deck, and the head gasket thickness. Bogie
Chevy piston squish bands are only 3/8 inch wide.
Small block Ford pistons are made with a 3/4 inch wide squish band. The dish is only 2 1/2 inches diameter.
This wider squish band on the Ford pistons is an advantage in that with most heads MOST of the squish effect is retained. That is why SBF have better detonation resistence.

Shoot for .040-.050 squish distance on the SBF.
You might check with Edelbrock and see if the thin .025 copper head gaskets will work with the alum heads.

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