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pretty much as close to a stock replacment dimension wise as you can get. forged mahle's are good units and they come with some kinda heat/wear resistant coating too.

http://www.csgnetwork.com/compcalc.html

10.1:1 cr, flat top mahle cast piston, yes.

plug in 3.898" Bore, 3.622 stroke, 3.910 head gasket diameter, .047" head gasket thickness, 66cc combo...