Quote Originally Posted by Buttafewcoe
Pretty sure it's just a 160 degree 5.7L GM thermostat.
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Can about pick one up anywhere
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Hope this helps
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B
I did pick up a thermostat today to put in, my marine shop couldn't find the reference for the Indmar. The good news is when I pulled the original thermostat it was only stuck open with some gasket or sealant material. I was just going to throw in the one I just bought, except when I compared the two the newest one didn't look like it would flow the same. The opening seemed to be only wo thirds what the factory Indmar was. So I cleaned and tested the original and it works great.

I also found my leak, the water strainer for the gravity tank was leaking. I do have a new issue though, the gravity tank fills while I am under way even with the switch off? It's like the solenoid witch never closes. Getting closer to being broken in, can't wait to ski!

Thanks again for everyones input!

Oh yeah the Indmar Thermostat PN# is 985009
The Sierra PN# for 5.7? 160 degree thermostat is 18-3649