Perhaps the bolts are in the water jacket themselves. I don’t know much about these motors but know many Chevy motors have multiple boats that must have thread sealant or coolant will leak out. Hopefully it’s as simple as that.
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Current boat(s):
1985 V-20 Cuddy/ 470 IB/OB
1972 Egg Harbor 38’ Sedan/ 454 Crusaders
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