I know people have tried the sla route but couldn't find anyone reporting back on long term use, longevity, failures, and it still seems kinda up in the air. Has anyone tried anything with the oil passages for the hla? Good/bad. I know there is a TSB on replacing the rockers with updated ones with larger feed holes drilled. Anyone try drilling out there stock ones or even the restrictor in the block that feeds the head? I'll be running dual valve springs with a port an polished head, new valves and guides. I was hoping to make the hlas last longer or if necessary convert to sla. Hlas are easy to replace but I dont wanna have to do it constantly. Thoughts, ideas, old posts I missed are all welcome.