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Thanks everyone for all the good info.i wasnt sure what the compression was on a stock 400 but was hopeing that useing the 915s and some mill work that i could get real closr to 10-1 comp.i knew that the comp was low but did not realize that it was that low......yes its just going to b a half ass street motor for my 17 year old son.i had some parts laying around so i thought instead of having the 400 crank polished,i would polish a 383 crank and b somewhat better. Lol

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If you use the 915's, zero deck/flat top piston combo, choose a cam that will pump up cylinder pressure to "create" a ratio closer to 10 to 1 cr (effective). Definitely need to play with the ignition timing for MORE SNAP!!