Quote:
Originally Posted by Formulajones
Must be something new because 25 years ago the L2257 TRW 428 piston was a flat top.
I had to machine a dish in them, which ended up being 16cc. Then zero decked the block, or close to it (.004" in the hole) and with a .038 gasket and a 76cc head I had 9.7:1 compression.
Ran that engine for a couple decades on pump gas.
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There could be a flat top version, TRW had flexibility years ago with compression ratios. My stock 69 428 had the smaller dish in the factory pistons.