I know the 5.0's have a 50oz. external balance to them. My question is if you take a motor to the shop and get it bored and change the pistons, rods ect. and want to get it balanced by them. Can they balance it internally and not do any drilling etc to my damper or flywheel? The reason I'm asking is if they external balance it by drilling holes on the balancer or flywheel, what happens in the future if you decide to replace the balancer or flywheel. I figured if they could balance it internally, I could always replace the balancer or flywheel with a standard 50oz. piece. What do you guys do?