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i just got rid of a 91 omc 302.
I replaced the risers and manifolds as a set. That is what's advised, every 4 years in salt. Risers may look fine on one side, but removing them lets you see how the heads look as well.
Now, most thermostats open at 160. If I was running 180, that was hot. Good running temp is anything around 168 or below. 240 and you are cooking it....I hope you immediately shut down!
When i got that hot, it would take a lot longer than 10 minutes to cool down.
I also replaced all the hoses which wasn't that much. I would check for a loose belt , as well if you have a Cobra outdrive, there's a little hose in there from the pump that can get clogged...happened to me.
Now here's the good news, if the heads are the same between a 302 and a 350, I have my old set sitting on a shelf that I believe are good, that I'd let go for cheap, or for barter.
try the other options first. Don't keep running if it gets hot. Fire it up and let it idle for some time and see what happens. A simple measure absent a gauge is simply to rest your hand on the riser, they should get warm, ut not burn your hand. It's normal for one to be a tad warmer than the other.
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