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
Trust me I know all about the cost of valve train failure with these setups. Mine is a low deck with 440-1 heads.
Is it doing it on the same intake rockers every time or is it random? What size and wall thickness are the pushrods? Better to be on the heavy side with them than on the edge of being too light from what I have learned. I have 7/16 .120 wall in mine.
