Been thinking about this some more and now think I remember the part about the P65 having the BP cyl but not the BP piston. It seems I thought there was a difference in the piston pin also which would maybe mean the crank was different as well.
I don't think I knew about the crank brg being different on the 65 and 655 then the 62 etc.
I don't think I knew about the crank brg being different on the 65 and 655 then the 62 etc.