470 Overheat

[dan4836]

Found my problem! After replacing just about everything, I found my thermostat is incorrect.

I researched this for weeks and found the thermostat my engine calls for matches to a Mercruiser part number that is incorrect. I put the thermostat for the newer, aluminum type manifold in my older cast iron type (first generation 470) and it worked perfect. 170 degrees at 4000 RPMs for ten minutes.

I wonder how many other people are using the incorrect thermostat in their 470 based on Mercruiser's numbers.

Now I can post about other restoration projects and maybe show some fish pictures this year!