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i recently bought a boat that was only used in fresh water , now i am going to be using it in saltwater so i want to make the engines fresh water cooled

the motors are mercruiser 502(415hp).

mercury makes a kit , has anyone done this ?

is it worth it ?

does anyone else make a kit/conversion?

thanks in advance

I did that to my original stock 454 magnum mpi, which is basically the same engine as you have. I bolted on a Mercuiser kit that I got from Bam. It fit like a glove and worked perfectly. In fact, when I upgraded my engine to my current 700 hp , na 540, I bolted the kit on that engine. Surprisingly, it works great on it as well. No overheating issues at all. See attached link...

http://www.mercruiserparts.com/Show_...COOLING+SYSTEM

thank you

ttt

Thought about it......but added fresh water flush instead.

Monitor Marine Products has a nice kit . I just bought thr 500-700 HP version went together very nice.
Steve