My '72 Pantera had 37,000 miles on the odometer when the two-piece valves decided to part company. I wasn't driving vigorously at the time, and the cam and intake limited me to 5500 rpm on that engine anyway. I was cruising at a constant 3000 rpm or so when the motor just shut off. No bang, no explosion, it just stopped working.
They are right - really bad things happen to a 351C when it "processes" valve parts.
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