Bobweight for Mopar-Perf partnr. P5007256 4-inch stroker crank

Yes there is a target bob weight that the crank was designed for, that doesn't mean it can't be changed. Lighter is better, less stress on all the parts involved. I would never choose rods and pistons based on the target bob weight. It would probably require less work to balance but so what, it's not that expensive to start with.