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Yes, the cast iron flywheel, if not properly balanced can be a time Boom. The early 9" flywkeels had a large lip on them which we vut off in a lathe. re drilled for the 10" clutch and off we went. Most of the time we got away with this. However on one ocasion the flywheel came apart, fortunately the force went down driving several large pieces into the track. If you make any modifications to the flywheel, which I don't recommend,have it rebalanced. For streeet the heavy flywheel is bettr anyway.
Gramps