Hi M8
as injected 250 said the compression bowl is in the piston on Xflows fitting flat tops will smash the valves to bits with std cam never mind a Big cam.JP engineering in south aus (0882617222) do a piston @ 83.5mm (part no Q202087) which will give 10.5cr & 1700cc the valve cutouts are something like 50thou deeper & wider, for Big cams and overlaps,this is used with std head gasket.I have used this piston for quite some time now with no worries about water jacket leaks etc.
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