Mark i wrote about the lifter mod that i do a couple yrs. ago. It was because some of the newer lifters have direct roller lub with a .015/.020 hole out the bottom of the lifter for extra oil on the cam and roller. what i do with the lifters without the direct oilers is i grind a 1/16" flat on the bottom half of the lifter ctr. facing side which does the same thing as the pin hole for oiling the roller. But it in no way puts more oil to the top of the engine, and it pulls the oil out of the oil gallies. What the dart tech was talking about was grinding a 1/16" flat on the top half of the lifter and that would put more of an oil mist on the top of the engine, but still wouldn't put direct oiling on the T&D rollers or the springs.
JMO
Zip.