Originally Posted by Louisville Joe
And don't overdo it with the starting fluid or you may blow the head right off.
You *could* blow a spark plug out of the head (aluminum threads), or possible blow the head gasket from a cold engine, but you'll never break 5 steel bolts let alone get the head to release. At worst case, and even that's a stretch, you could pull the studs from the aluminim case, or loosen them, or pop a hole in a piston.
But I know what I'm doing with that old lawn mower I have out back..........