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So ...unless you spin your motor over 14,500 rpm and then have a sprag failure - there is no way to typically "explode" a 727 ?

I have seen my share of the "stocker" drums coming apart. The last one was at Milan Dragway in a Duster. Even with a blanket ... it blew-apart a fiberglass dash and shattered the windshield !



Well, did you read the specifics on the failure testing? 14,000 equals approx 6400 rpm, which any bone yard mill can hack up to.