I simply asked a similar question over at fbbo "When would you consider blocking the non-bearing feed oil galley".. merely as an academic question and was pretty much ridiculed.....
"Why the hell you block off oil to anything!!??" was the typical response.
Kinda surprised me actually, considering who some of the comments were coming from. It was like they'd never heard of such a thing.....
I think PRH gave the only respectable response (because he's cool like that) which was that he never blocked off the feed, restricted it maybe, in certain applications.
Anyway..I wouldn't block it off if using EDM lifters which is kinda what the guys above are saying.
I'm still unsure as to when (as in what performance level/expected RPM/etc) it's desirable to block it. YR's answer sheds some light, maybe just builder preference with certain lifters? But then the factory didn't block anything off....and those tappets were the smooth non-oiling style.
