Overheating 888
Those log style manifolds and the risers in the 70s early 80s
Mercruisers tend to plug up. You might buy a little time by acid
boiling them. But in my opinion it's better to replace them or upgrade
to a center rise exhaust system. The other part that is prone to
failure is the stern drive water pump. They should be replaced at least
every 2 years.
Jim
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