ballpark guess using 62cc chambers makes 11:1
a 13cc dish piston gets it down to 10:1
Open Chamber heads milled to 72cc's makes the same 10:1 and flow better
or modify the closed chambers to a 72cc volume, unshroud the valves and leave only 1 quench pad. chamber pics here http://pantera.infopop.cc/eve/...0045562/m/6700079993
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