Petcock, etc.
Just like the name "petcock"--must be my love of British cars. Yes, it's the quarter turn valve at the bottom of the radiator.
The oil cooler (on mine, anyway) is an aluminum block that sits between the oil filter and the engine block. It has two hoses & I just pulled off the lower one. Got some misc. gunk out of the block by flushing with a hose into the coolant reservoir and letting it run out of the lower (front) oil cooler hose.
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