The pontiac flywheel (alum) that I got had a counterbalance weight bolted on the engine side. I sent it to the machine shop to check it out just to be sure and it was pretty close to zero (w/ out the bolt on weight; the clutch was balanced independent of the flywheel).
I think that stock Pontiacs have slight counterbalance and so McLeod must be conforming to the stock specs. When I exchanged flywheels I asked if they (McLeod) could zero balance the new flywheel and they declined, but it was little trouble and money ($50) to have it done at a local machine shop.
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