I bent a few pushrods and broke a couple of rocker arms, but it was the combination of too much fuel. I was using injectors that were 30% rich ( and timed wrong I might add) and propane. I really think the problem that I had was the injection duration was too long, thus, the fuel was burning longer than it should have in the cycle. It did it during a down shift to pass at 65MPH....

It did make lots of noise......

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87 300SDL - 215K Miles !!
99 F-350CC Dually PSD - 190K
86 300SDL - 189K
All on B-100