Collapsed Lifter???!

[bingham72]

Ok, just got around to tearing down the top end to replace what have assumed is a collapsed lifter. It's only been makeing noise for a year now.
Check out these two pictures. both out of the #7 cylinder. The first looks like a normal lifter. It is on the intake side.
The second was a royal PITA to get out of the block from the exhaust side. The bottom feels concave and the wear pattern looks all outta sorts. The bottom edge is sharp as well. I bought a whole new set of lifters, however, do I need to inspect the cam as well? What would cause this to occur? What about the valves? Could they be damaged? I don't want to put the lifters back in if there is potenitally other issues.
Any help would be greatly appreciated.

[bingham72]

after googling this to death. Looks like I might be due for a new cam shaft...
maybe a good time for a roller cam upgrade..

[David Pozzi]

Probably a bad lobe on the cam. Can you see the peak of the lobe if you rotate the engine?
If you have a dial indicator try measuring the lift for that lobe and compare it to a similar lobe to see if you have lost any lift. If the bad lobe is an intake, compare it to another intake, not an exhaust, the exhaust may have a slightly different lift.
Putting new lifters on an old camshaft isn't a good idea anyway so you are going to have to replace the cam. A hyd roller cam would be nice.
David

[EFI69Cam]

A roller would be more than nice. A roller cam will survive with the low zinc oil that probably killed your current cam.

[bingham72]

A roller would be more than nice. A roller cam will survive with the low zinc oil that probably killed your current cam.

interesting...yeah, I've been reading a lot lately about the low zinc in oils.
So that begs more questions.
1. What else should I inspect while I have the engine apart?
2. What type of oil should I be using?
3. Any suggestions on roller cam manufacturer?
If I'm going to invest in a roller cam, i don't want it to go south after one track day.

Moderator, I guess this is no longer an emergency. Unless you consider needing $$$ and emergency!

[slowcamaro]

1. If the lobe went, the material went somewhere, drain the oil/pull the pan and inspect for metal particles. Wouldn'y hurt to disect the filter.

2. Oil is less of a concern after initial break-in consult the cam company. I'm running 15-40 rotella diesel oil and will be switching to amsoil once everything is dialed in.

3. Manufacturer is a question you'll get a million different answers to, just make sure you're gettinga cam that suits your combo. I like the prompt response and detailed input I recieved from reed cams. That being said. Shop around.

http://reedcams.com/camform.htm

[EFI69Cam]

interesting...yeah, I've been reading a lot lately about the low zinc in oils.
So that begs more questions.
1. What else should I inspect while I have the engine apart?
2. What type of oil should I be using?
3. Any suggestions on roller cam manufacturer?
If I'm going to invest in a roller cam, i don't want it to go south after one track day.

Moderator, I guess this is no longer an emergency. Unless you consider needing $$$ and emergency!

I'd talk to comp cams. They have some decent lobes and have also been doing alot of R&D with beehive springs. BBC hydro rollers tend to float easily due to the heavy valve train. The conical valve springs help alot.