383...diff. year question...

Thanks Rob. I see 1.84 for the Sealed Power cast pistons, and 1.92 for KB forged.I assume the taller factory cast ones were 1.92 as well then, to gain back the lost compression?

Perhaps. You never know regarding aftermarket. The best thing would be to find a factory piston and compare....but that might be difficult. I would guess the KB would be it, but that's a guess.