buildin my first race engine, i got flat top pistons, zero deck height, and 67cc combustion chambers, i dont know how thick the head gasket is but maybe sombody could give me an approximate comp. ration so i know what kinda fuel to dump in it,

ty

here is a good calculator.
http://www.rosspistons.com/calculator.php

you can look crush thickness of your head gasket on felpro web site or it will give you a close number to go with.

on second thought this may be better

http://www.race-cars.net/calculators/compression_calculator.html

thanx big mike...i appreciate it

whoaaa...im alomst 13:1...what octane rating should i use???

vp-c12 or equal
turbo blue, and torco mac good fuels