Checking Sprag

moper said
Sorry - the info I had is very different on the rpms the drums would survive at. It's a lot lower than what you're saying. I know of two that have let go at engine speeds below 4K. One while on the two step, one as the car was moving in 1st gear.

Maybe I'm confused...lol. Been a long day.
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I'd say it depends on the drum. As Don mentioned these things are old and who knows how much abuse they've seen.

The only one I've seen let go was at the drag strip on the hit. It survived the water box but exploded at the hit.

My 727 has a steel drum in it.