Ok. I will start with the specs. 71 340, 30 over, just rebuilt, engine wasnt hurt. Lunati Vodoo hydraulic 513 533 duration, 234 242 lift. Double valve springs. Started off with stock rocker assembly. Had a what I would describe as valves smacking. Car ran fine and has great oil pressure. So I thought an adjustable rocker assembly might get rid of any noise. Bought push rods, rocker assembly, installed and adjusted. Preload is .0203. Fired it up. Was noisey. Lifters were makin noise. Shut it off. Waited a while and backed it out flipped it around and backed it in. It sounded better. So I took it down the street a couple blocks and sounded pretty good. Next day I fired it up an 0 noise. Took it foe a longer drive. The noise came back after driving for a while. Maybe even a little louder. Kinda scratchin my head. I am more than frustrated. Still had great oil pressure and car ran fine. Lifters are pumped up fine. Forgot, lifters are comp cams CCA-867-16. Also when I did the break in I only had the single springs in. After I installed the center ones is when I noticed the noise. It doesnt sound like lifter to me. Any help would be appreciated. Noise is more noticeable around 2100rpm.