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rsimoes,
Virtually every sports car (Le Mans type) and formula car up until the last couple of years, have run a light steel flywheel. (The current stuff has no flywheel on the engine, the clutch and reaction plate is carried in the gearbox.)
I have never seen a flywheel failure in any of these cars. 9500 to 13k rpm is normal running range.
On a BB Ford engine, I do not have a clue.
Also, I do not see how a light steel flywheel can allow the engine to vibrate any more than a heavy unit. The heavy flywheel may well change the harmonic frequency a bit, but balance would not change.
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