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One more thought, Removal of water jacket covers often has the result of broken bolts due to rust on the threads protuding into the coolant.On a '29 Essex there are two covers, each with 8 bolts. A total of 16 bolts. The last two motors each had 8 bolts broken. A lot of effort to remove them. I replace them with shortened bolts that do not enter the coolant area.
35 Terraplane said:
Typical antifreeze will soften and dissolve most automotive paints