Quote:
Originally Posted by mgarblik
The complicated issue is from the factory, the final precision balance was achieved after the engine was assembled and the flywheel was installed. The factory would spin the rotating assembly at a low speed and take measurements. Then a final balance would be achieved by removing a little extra metal from those giant divots in the flywheel. So essentially the born with flywheel was matched and mated to the crankshaft. Made for a smooth engine but caused some trouble in service later when parts needed to be replaced. But it was only a finish balance.
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Wrong.
The final factory balancing, with a fully assembled block and flywheel/flexplate, was achieved by removing metal from the crank counterweights.
The flywheels and flexplates were all the same, and this for NOT causing problems when these parts needed to be replaced.
And, If you were to buy a new flywheel from Pontiac back when new ones were available you would get a 9779232, same for all 1965-75.
FWIW