Optimum engine temp?

[jsaylor]

I just purchased this boat so I don't know history, it's a 25ft tahiti daycruizer 1980 with a 454, I now it depends on what thermistat is in the engine, it runs between 175 and 180 is this normal or optimum?
Thanks

 

[mkast]

Re: Optimum engine temp?

What kind of cooling system is the engine using, closed or raw water?

 

[jsaylor]

Re: Optimum engine temp?

Raw

 

[Brentathon]

Re: Optimum engine temp?

Those temps sound high to me, for raw water cooled, no?