I had Scott do the oiling and go through my motor a couple seasons ago and he set up mine with his standard rockers and trend pushrods, it worked good until when I freshened it I went to a stiffer spring then I started having rocker and pushrods problems. I went to a .130 wall 3/8" pushrods and Harland sharp single shaft rockers and had no more problems. I think the black standard rockers fatigue after a couple hundred runs. Harland sharp are $1200 complete any ratio. Poppaj