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This is not normally a concern unless the engine is known to have been filled
with water(no antifreeze) and has been frozen. Even then, usually the
soft plugs along the side of the engine will be forced out without damage
to the cylinders. Cylinder heads are a little more problematic but still
not very likely to be cracked. The ones that I have seen that did have
cracks had them between cylinders #2 and #3, straight across, and the
cracks were easy enough to see with the head off. I suspect they were
caused by improper head torquing.
--
George Downs, The "original" Walrus3, Bartlesville, Oklahoma
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