Just thinking about what Danny did on his pistons gives some credit to balancing each component on an individual basis. ie balance the pistons separately from the wrist pins , balance the rods separately too. VS mate a piston with a wrist pin etc. to get everything balanced as assembly (piston, pin,rod) that equals the other three assemblies. If that is done and a piston change is necessary, the. other components of the assembly will no longer be in balance..............Bruce