collapsed lifter?

[schacher94gt]

Over a year ago I put in the e303 cam with new lifters and just recently I had a sound coming from the passenger valve cover. We pulled it and found to what looked like a collapsed lifter. They were under warranty so I put brand new ones back in started it up and the sound was still there . Is there something that could be making them collapse? I have stock length gt pushrods and rockers on gt40 heads. Also my oil pressure was inconsistent while this was happening...oil pump finally going out maybe?
thanks

Alex

 

[revhead347]

You may have a blocked oil passage going to the lifters. It could also be physical damage to a cam lobe. Start it up with the valve covers off and check how consistent the oil flow is out of each rocker.

Kurt

 

[schacher94gt]

that was my next step to pull the valve covers. i was adjusting my timing when it started and for a couple weeks before hand my dummy oil pressure gauge would drop to 0 when my rpms would drop past 1000. if that helps w/ anything?
thanks again

Alex

 

[revhead347]

As long as you're getting 20+psi at idle, and 40+psi above 3000rpms, the oil pressure shouldn't be an issue.

Kurt