.Re: 165 cylinder head
The head was most likely the thing that rotted thur, that was the case on my 165.
I replaced the head and all was fine.
so not replacing the head was a good thing!
The only difference between a car (Chevy 250) and Boat motor was, that the freeze plugs were brass so as not to rot out.
And the Boat motor had a different cam in it to give you the 165 HP, Car motor of the same only has 140 HP.
Also boat motor a Marine water pump and other small things, that won't make to much difference other then they will wear out faster.
Good Luck and welcome to the site!
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1986 V20 
Old Fishermen never die, we just SMELL that way!!
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