your rocker shaft s are shot .i can rebuild the rocker s re bush and re arc the tips if bushing are not bad i can just re arc the tips about $25. to do all 16 rockers . rockers shafts can be metal sprayed and reground to size if new ones can not be found .i deal with a shop that has built shafts up for me that can do that as well if you can not find anyone near you i can rebuild them