[Formulajones]

Originally Posted by racerboy

The pistons have some carbon on top. Do I have to get rid of that (and how)? Also I don’t think it is at zero-deck. It looks like when it is at TDC the piston is still a little below the deck.


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Just an FYI, those are the exact same pistons I used in a 428 build I did about 25 years ago. The L2257 is an old TRW forged flat top piston for a 428 with 4 valve reliefs. Obsolete part number now I believe.

So that dish is machined in there. Here is a picture of mine after I machined a 16cc dish in that same piston. When I ran these pistons in a .030 over 428 and .004" down in the hole with a 76cc head, my compression was right around 9.7:1

Your dish is much smaller than mine, so you'll have to measure it.