Ever see a fly wheel come apart at 6500? Happened in my 70 340 4sd Duster about 40 years ago. A piece went through floor board about 2" from my right foot. Another piece went straight up took out radio and went through the windshield. Both ears on the back of the block were broke off. Engine was junk after that. Last time I ever went rowing gears without a scatter shield and backing plate.
