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Does anyone know if an HH70 piston,will work in place of an HH60 piston , if you bore it out?
Thanks

I doubt you have enough cylinder material to bore it out. HH60 has a cylinder bore of 2.625”. HH70 has a cylinder bore of 2.75”. Also the connecting rods and crankshafts are different. Could get very expensive. Standard piston for HH60 is available.