I have 325 on the seat and 825 over the nose for spring pressure. The side loading and hammering first wear out the snap ring the needle bearing cage runs against, which also keeps the rocker arm in position. At some point the side of the needle bearing cage gets crushed or broken, then the needles seize and the carnage continues and if you don't catch it early the little F'ing needles take out the oil pump. I went to bronze washers to register the rocker arms, but something wasn't right on two intake rockers and the washers got chewed up and siezed the bearings again. The cost is starting to add up