Basically its coming from driver side valvetrain. Its a clacking like a really loud rocker. Car has new hardened push rods, new pro mag rockers 1.6 nsa with gm guide plates, comp 918 springs with tit retainers and 10 degree locks. All parts are close to new having about 1k miles on them. No noise ever came out of the valve covers I had one of the quietest I've heard with these rockers etc.. So i thought it was a bad lifter since I had comp rs with about 1k miles on em so I swapped to brand new oem style and it didn't fix the prob. Basically it wont make the noise at idle but it will once I rev it up a bit and it will make a clacking metal sound then just a progressivly louder slapping noise. If I blip the throttle the noise takes longer to rev down than the engine it's weird. I checked guide plates and they had some wear on them so I am swapping them out for another set but I just wanted to see if anyone had ideas. Btw the whole motor has less than 1500 miles and EVERYTHING is new. Heads were just installed about 200 miles ago after I blew a head gasket. And they were disassembled and reassembled with new guides and valve job.