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Here is just a thought. I have no clue if this is relevent. In discussing P&Cs with a friend the issue of ovality came up. He indicated that on bikes the cylinders need to have a torque plate installed and then be torqued to spec before testing. He indicated that some cylinders that would test out of spec would come into spec when torqued. I have no direct experience but thought I would throw it out there for discussion purposes.