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Dan;
Bruce beat me to the reply,defintely use flat top pistons with the four "eyebrows".......That's what I have in my 351-W,but mine are the el-cheapo cast pistons and I wish I had sprung for the extra bucks and had gotten better pistons... So far,they have held up,but I expect any time for one to let go at the track........
My guess is with 60cc head chambers you are looking at at least 9 to 1 or better compression depending on the piston to deck hieght in your engine.... When I put my engine together,I found my pistons were .070 down in the hole and had my block deck cut around .035 or .040,can't remember which to get my compression up where I wanted it,just over 10 to 1 ........
Install the crank and a couple of pistons and measure the piston to deck height,(it may vary a quite a lot from block to block) and then calculate your compression ratio and go from there..........
David
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DAVID GAGNARD
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