If the valves have hit the pistons..
#3
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A guy with a BBC had almost every valve bent b/c the cam was out of timing. Bent valves and pushrods everwhere. I'm assuming the pistons have some decent marks in them, probably worse than just floating the valves once at a high rpm.
#4
I started my car with the cam timing way off (don't ask me how, because I have no fn clue), made smiley faces on my pistons on all the exhaust valves and bent the valves, but it runs great.