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I'm having my rockers refreshed soon, and will be using new shafts. Maybe I'm second guessing Ford's engineers but the oil flow to the rockers just seems on the weak side to me. Oil does flow to the rockers as designed and I have between 15 and 20 lbs. pressure at hot idle with 40wt as indicated by a mechanical gauge. I'd just like to see a little more going to the rockers to hopefully reduce wear there.