On the iron heads the oil hole is 5/16".
On the Edel heads ( mine anyways ) the oil hole is 3/16".
I would still restrict down to at least a 0.080" hole. That's with my Erson Rockers on the Edel Heads. Which Erson recomends anyways.
To block or not to block the lifter galleries.
Some say yes, some say no. I have just put the stick in and did not block them and had no bad things happen so I would say no.
