'68 318 - Coolant left in heads when removed.

IQ52 said
Damage? With a screw driver? Damage what? If'n you are tough enough to poke a hole in a cylinder wall or something with a screw driver you's a mean SOB. Kinda sorta the guy who pours Coors on his Wheaties in the morning!

Did see a guy try to drill out his freeze plugs. That action did lead to a whole in a cylinder wall.
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Where the damage normally occurs is the seal surface of the block where it meets the freeze plug. I've seen pry marks that were bad enough where a standard freeze plug wouldn't seal anymore and they had to use one of those rubber expanding types to seal it up.