oil drips from the 2 large holes that open to the lifter valley. You can drill an 1/8" hole in the upper pass cam plate bolt for extra oiling (duplicating OE). For the nth degree you could drill a .015" (1/64 drill bit) hole in the pass front horizontle oil gallery mini freeze plug (best would be to tap for a pipe plug (alum) & drill it then a 3/8 hole in the cam plate for that oil to squirt past. #1 get a good quality chain set