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Well 66, I think you hit the nail on the head. Hardly any oil out the sides with the 440SOURCE shafts and HS roller rockers. It's now WAY better with the Isky's.
Isky & Erson are pretty much the same. The Isky has a hard pad for the valve. I had very good luck with the Isky's on several motors with excessive RPM's. The Erson seemed to be fine also. Good fit on the TRW thick shafts I used with both Isky & Erson.