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Oil cooler

I/O`s dont use a oil cooler? If this is a inboard ,then yes. poor water flow thru the oil cooler


1987 454 with a Alpha drive. It’s a oil/ PS fluid cooler. I checked it with a flashlight and didn’t see any obstructions. But the cooler is the last thing I haven’t replaced. So it’s suspect despite the fact that it looks clear. I’ve literally checked and replaced everything at this point. From the elbows to the impeller. Hoses are all correct and clear as well as gaskets. Tried a 140, 160 degree t stat. Only thing that helped a bit is running it with no t stat but even then she still builds heat when I’m on it. It’s all been replaced. Even got a whole new engine in there now. VERY frustrating! Cooler is the only thing that hasn’t been replaced.

although the light test didn’t reveal any blockage, could the oil cooler still cause a slight overheat condition (gets hot at higher RPM)?
 
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