Location for oil holes on rocker arms?
You don't think getting oil to the roller is critical?
There is so much oil blowing around in the valve covers it won’t really matter.
He had springs with 300 pounds on the seat and 650 open I’d want more oil there.
I have that same rocker and I blocked off that oil hole with lead shot. I was screwing around when the engine was on the run in stand and like a MORON I had the valve cover off. I was priming my junker and I usually leave the valve cover on until I prime for a bit and then pull them and have a look and THEN prime the engine by hand, with a speed handle (only going to do that anymore because my hands hurt so bad after I’m done I couldn’t even pick up my phone) so it doesn’t blow oil everywhere.
Anyway, I grabbed the drill and pulled the trigger and blew oil all over myself, my lathe, the wall and one stream went all the way up and douched the damn ceiling.
That’s when I blocked that hole. It’s way too big and it really should be putting oil on the spring.
Of course, I was pissed, popped my cork and called PRW and asked them why the hole was so frigging big and why it was on the top of the rocker.
I finally got some dude on the phone and he said they put the hole up there so the oil comes out of the rocker, hits the underside of the valve cover and literally showers the springs and rollers with oil. On paper...it makes sense. He also said they considered putting the hole where the oil would blow on the springs but they were worried that it would over load the valve seals and cause the engine to use oil.
And I said well make the holes 75% percent smaller, and he said restrict the oil to the shafts, and I said I Am. I’m running a .100 restricter up there, and he said cut it to .060!
At this point when my junk goes back together this year I’m thinking I’ll drill a .040ish hole to blow on the springs and keep the upper hole blocked.
It’s unreal how much oil gets to that hole. Oh yeah...I remember now why that is too. It’s because they use two bushings in the rocker that leave a gap in the middle of the rocker for oil, rather than one bushing. That does help oil feed to the adjusters but damn it allows so much oil to that hole.