Mercury marine 165hp six

Wesman07

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My wife just got the crazy idea to buy a 40’ house boat. All I know is it has twin 165hp mercury six’s in it. The boat is from 1977. I believe it’s a 250 CI?

Does anyone else know more about these motors?
 
I know that Mercruiser I/O had 250 Cu/in, in-line six Chevy engines.

Also Chevy and GM, in-line 4 cylinder engines
 
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