OK, folks help me out here. I just installed a new GMPP Lt4 Hot cam kit in my 96 LT1. All was well. I took my time and installed the new GMPP LT4 hotcam, kit came with lifters and lifter tray, and 1.6 roller rockers. I used my original push rods, all checked ok installed a new LT4 HD timing chain set and new Accel Opti. Had the pcm tuned by PCM4LESS. Went together fine, cranked and ran/runs great . After a couple of hundred miles I now get a LOUD clatter from what seems to be cyclinder #8 around 2000 rpm. I warmed up the engine, pulled the valve covers to readjust lash hot and running. Only odd thing I noticed was last valve at back of passenger side was getting 10 times as much oil to the top as compared to any other valve. Oil spraying everywhere. Valve lash seemed ok, and I adjusted to zero plus half a turn. Capped it all up, engine cranks fine, runs fine and is quiet at idle ( normal ticks and clicks) but at 2000 or rpm, clatter is very loud. Quiets down at higher rpms and is quiet at idle. What gives ? Any suggestions ?