I'm not familiar with that engine's oiling system but one thing comes to mind. Are you firing the engine up & checking oil flow or are you turning the engine over using the starter & watching for oil flow? My 216 feeds oil fairly quickly when running but takes 15 to 20 seconds for oil to appear at the head if I use the starter only. Just a thought.

Save a life, adopt a senior shelter pet.
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Name your dog Naked so you can walk Naked in the park.