Not Ranked
The cast iron will not will not hold a clutch or flywheel failure. The cast steel scattershields were outlawed for racing but who knows why. One reason may be that they did not provide full containment towards the engine in case of a flywheel failure. A jaded thought is that the manufactures wanted to sell new scattershields.
I had a friend in a 409 Chevy lose a clutch through the lights at the drags. He had a stock cast iron bell housing. It took out the timing lights and pieces of the clutch came through the floorboard, dash and windshield. He was lucky that nothing hit him. I would assume he was turning around 6,000 rpm.
Have fun, Ray
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