Tom Wells Tom I'm not a pro builder but been there,done that with different motors. Thanks for the site on the oiling mode. Here's the thing, 1/16 of an inch is huge
You want to spray the area not flood and loose 10-20psi of pressure. On my motors, for the timing chain to get lube, .015" with the hole looking like a spray nozzle. This fans the
oil out. Over time the hole will get bigger but this was a new motor to 50K.
Oil for the distributor is about the same.020" Same thing, spary the
oil but not flood the area. I'm not sure what your FRANGIBLE issue is??
Location, oil flow, Oil shaft issues, or just the old engineering sillyness?? I know you run 1 quart low.
That scares the crap out of me.
Different motors different modes.
Rick