All stock Pontiac V-8 except 301 and maybe 303 and maybe a couple of other rare exceptions are internally balanced. Rods and pistons are also balanced by matching for weight. Holes are drilled in the counterweights, or weight added, to balance the rotating assembly. That means the balancer and flywheel are neutral balanced, they should not affect the balance of the rotating assembly.
Vikki 1969 Goldenrod Yellow / black 400 convertible numbers matching
