above deck ?

RustyRatRod said

Several companies make off the shelf pistons that will make a quench condition with the standard Mopar small block open chamber head.

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... provided you do a lot of checking and special machining of the chamber roof and the pistons. I did one and wouldn't do another unless it was forced. Just my opinion but the potential benfits aren't worth the $$ if you're paying to have it done.