Sorry this is kinda a long post, I'll try to keep it short. I have a 72 Jimmy that has a 350 in it. A few years ago I rebuilt the motor and when I did I succumbed to the temptation to hop it up a little. It has 10:1 compression Vortec heads and a comp cams Magnum 270. After it was rebuilt all seemed fine and then one day on a long road trip I had a lifter collapse. I pulled into some po-dunk town and replaced the lifter. Shortly thereafter another lifter started making all kinds of noise that I couldn’t adjust out. I thought I might have gotten a bad batch of lifters and replaced them all. That seemed to fix it for a while but the lifters started making noise again. It wasn’t bad so I just let it go for awhile. I noticed that when I would change the oil the lifters would make more noise for about 100 miles and then quiet down some. Finally, I couldn’t take it anymore and pulled the lifters and measured the lift of the cam. Several of the Lobes were worn so I replaced the cam with a comp cams extreme energy 268. While I was at it, I put in roller rockers and new springs. Broke the cam in, everything seems fine except the lifters are still noisy! I have adjusted them several times both hot and cold. I suspect that I might have an oiling problem, but I see oil at the rockers dribbling out at idle so I don’t know. Any Advice/suggestions?