Gen 5 to Gen 6 flywheel ???
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If they were the low hp 454MPI's with cast cranks then it's a different flywheel. The 454MAG uses the same forged crank and has the same flywheel as the 502. There is an extra counter weight cast into the cast cranks so it takes a slightly different flywheel. If they're the wrong ones, any good machine shop should be able to balance them to the GM502 specs for cheap.