Reply To: 67 33HP Evinrude running very hot

[Don]

The only other idea I can come up with is that there may have been a change to the way the upper exhaust hsg was cooled between 1964 and 1967, and by swapping the powerheads, you may have caused an issue.  Again, just an idea, with no actual knowledge to back it up….  Anything is possible though.  Just please don’t rip that powerhead to shreds, looking for issues that aren’t there.  We may end up having to pull the powerhead back off the exhaust hsg though…