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Will PB Blaster or WD-40 negatively impact a cylinder bore?



I'm going to be cracking into my stuck ABA soon and since I won't have the head on it, I was wondering if I could use any of the known "break-free"/penetrating lubes to assist loosening the pistons from the cylinder bores without harming any internals.

My hope is to not have to rebuild the block if at all possible.

Thanks, JT