Oil was primed with drill during build. But seems I had a multitude of bad luck on this one. Started with a defective lifter ( or was oil problem what made it go ?) I did use 5w30 Mobil 1 and all the time, even now, the oil pressure is normal. I think that I had a weak link that finally...
OK , folks here is the result.
*&#%$ SPUN Bearing. After all the fus and how it ran so well after the hotcam install, I finally got around to doing what I did not want to do ( I did not want to confirm my worst fears ) anyway, Drained the oil, NICE metallic looking color, removed oil filter...
Oil pressure is normal. Temps of both coolant and oil are now lower than previous since I installed 160 thermostat. Oil weight is 5w30 Mobile 1, and yes this started after Hotcam install. Though it ran fine for a a few miles.
Had a new lifter go bad so I went on my gut and changed that and it...
Definately NOT gas or PCM tune.
Definately mechanical noise.
Seems to be coming from same problem cyclinder #8.
No noise when cold, only once warms up and only starts around 1500 and up.
I disconnected electrical to injector #8 and noise can then be heard ay idle.
Any ideas ?
Part 2,
After another 100 miles. I romped down on it and the ticking came back. I could tell though it was from a differant lifter. Decided what the heck and drove around a little and romped on her again. TADA the ticking went away. Seems this time for good as more hard driving couldn't get it...
OK folks here is the outcome.
1st, thanks to everyone for your input. It was most valuable.
Yep, It was the lifter.
I installed 2 new GMPP roller lifters in cylinder #8.
I certainly love not draining the coolant to replace these on the LT1.
Put it all back together. And TADA,
No more...
OK, covers off.
I cranked engine cold and the ticking seem to come from #8 exhaust. Also it was pumping oil back to the Mid East. All the others had the normal dribble. So I proceeded to remove intake etc.
Once in I took off #8 cylinder rocker, pushrod and lifter.
I did notice a sharp burr...
All springs are good. No broken ones. Seems like lockdown nut is awefull close to top edge of rocker. Coukd some interference be cause for noise here ? Also can a rocker seat be installed upside down, the part that sits on stud ?
Havn't checked valve spring yet, will do so tomorrow. Hope it is not a bad lifter. What a pain that will be. If it were a bad spring, wouldn't it make noise all the time. ?
As for hot valve set, seems that was when noise was worst.
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...
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