Quote:
Originally Posted by Mark Yacavone
Looks like this:
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Yeah, the factory 428 pistons had a small dish, to reduce CR.
BUT, I noticed that the NHRA specs describes the 428 pistons as "Flat w/notches". Don't mention a dish.
http://www.classracerinfo.com/Engine...0&MAKE=Pontiac
But, in order to get a piston made that NHRA would approve, I assume it would have to be made very similar to the original, including the dish.
But if not, stranger things have happened, concerning NHRA rules.