Just putting together the timing side of my A65 1971 model. The bottom end has just been rebuilt into NOS cases, the crank rotates nice and free until the oil pump locating nuts are tightened, the oil pump drive gear and the oil pump pinion are binding, back the nuts off half a turn and it's free again. The oil pump and and gear are from the old motor only the crankcases have changed, the oil pump studs must be closer to the main bearing by a thou. or two. The only way I can think of fixing this is to file some material from upper sides of the mounting holes in the oil pump to allow it to sit a bit lower, further away from the crank, I'm just wondering if anyone has a better idea before I hack into the pump with a chainsaw file ??