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a good long drive boiling over, usually causes top end damage. Things like warped head surfaces. Your concern is damage from the resistance the crank and rods felt when one or more pistons could not move in their bores because of the presence of water/glycol. Unfortunately, after an event like hydrolocking, it may be necessary to look at the bearings and connecting rods. When the heads are off, rotating the motor and observing if the pistons all get up to the same spot relative to the deck, may tell you if a rod is bent. The iron block of the Z32 should have fared well. I have had a cracked block in the past, in a motor that overheated but that may have been a casting flaw in that particular engine. That was a Ford 390.
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