Early models were way off, later "2.0" models had a recessed face for more accurate stock pulley alignment. IIRC my first genuine LA Fluidamper was alignment challenged. Fluiddampers wont need to be balanced. Balance your crank and flexplate/flywheel together then bolt up the fluiddamper. My balancer did adjust a stock damper to neutral on a 318 I built. It was a little off, Mopar tolerances he said...