I see what you're talking about now. I checked my GM race manuals, they make no mention of drilled galley plugs. Jerry might chime in with better info in this.
As far as the Great Oil Debate, lots of information out there, some of it true, some not so much. The main deal is using the ZDDP additive during break in. Once the engine is broken in, SM rated oil will be just fine for the average street engine, regardless of cam type. The real problems come from incorrect parts matching (exesive spring pressures), improper break in, improper engine assembly. Seems most engine builders prefer to pass it off on the oil manufacturers that take responsability for their own mistakes.
Something most people do not know is that engine oils are required to be backwards compatible, so while the ZDDP has been reduced, there has been anti-wear additives added to compensate.
