Originally posted by muteboy49
im getting my new motor soon and im starting on it ASAP and i just got my rods and pistons to the same weight. and a guy i was talking to said as long as they were the same weight i dont need anything balanced. is this true?
It sounds to me like your friend has taken some information out of context that he has heard in the past.

If you have a motor that is balanced and you tear it down to rebuild it and the pistons and/or the pistons/rods that you use to go back together with it are the same weight as the pistons and/or pistons/rods that came out of the motor, then no balancing will be necessary.

You are making no sense when you say that you have a new motor coming, yet you are presently equalizing piston and rod weights.????? If you are not rebuilding an existing motor and using exactly the same weight components that came out of the motor, yes the motor should be balanced if you want maximum satisfaction, smoothness and longevity out of it.