I witnessed a cast flywheel explosion on a 302 GMC six on a gear change at about 300' down a 1/4 mile dragstrip. Approx 6000 rpm, broke pressure plate,flywheel,disc, and a 1/4" scatter shield and buried pices 6" into the asphalt. A piece went into the spectators area, missed a guy by 2" and severely bent the A pillar on a late model pickup he was leaning on. Lots of energy there.
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"It don't take but country smarts to solve the problem" (Smokey Yunick)
'41 Merc Town Sedan / 260" 8CM engine
'66 Fairlane four door / "warmed up"
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