Replaced bad lifter, same thing.
 

I'm working on my brother's 85 cause he over heated the engine pretty bad. After doing some investigating we find out it has a bad lifter, #6E. When I tightened it a 1/4 turn the noise would go away for about 4 secounds then clack, clack, clack, all over again.

I replaced it with a new one, SOB, same thing.:mad:

I don't think it's a wiped cam lobe because I can physically see the rocker arms opening the valves. Also the lifter looked new when replaced. No wear on the bottom.

I forgot to mention, it's not a roller cam, flat tappet(lifter), 305.

pulled stud!

You know I read that on TGO! I'll check it out tomorrow when I get back from the drags. Thanks 12secondTA.

Well I checked the stud and it's fine. The clacking goes away when I add more preload but of course comes back. I talked to a CompCams rep at the drags and he was also baffled. He said the noise was the pushrod bouncing on and off the lifter.:eek: He said run it with Valvoline Racing oil 20w50. That should quite the noise down.

I'll take off the rocker arm and inspect it for damage later on.