....at least the ones worth their salt (oops) do! Salt water is pumped in, circulated through arasiator element which cools the FRESH water coolant in a separate coil....
Now, if'n you DON'T want the race boat ("suspect" engine etc.)---please contact me. No kidding! Especially if it's a vintage raceboat (New Jersey Sea Skiff, Crackerbox or other wooden type....)
While we have Mr. Fixit on the phone...what about that old saw I've been batting around, viz hp/frt-lbs and displacement. Is it of any value to have the cubic inches close to the power output numbers, in ordedr to lessen the stress and enhance the longevity of the engine? I am considering a 408 stroker and looking for 450-500 numbers, re hp and torque---several people said it will last longer, etc. than a 351 producing the same power. True? Or Malarcky? That is the question!