Collapsed lifter?

[Jdabishop]

Ok so my car has its first 100 miles after rebuild and ive been generous on the accelerating but it has a little power loss and when i come down from higher rpm it makes a whining/rattling noise like as if the cams arent rolling smoothly. But from low rpms around town its not bad so would this be a bad lifter? Had the same issue before rebuild and no its not rod knock motor is perfectly healthy.

Please help as if its the lifters I can knock that out no problem.

 

[FlyinTalon]

Pull the valve cover and check the rockers, move them around see if any of the lifters are not pumped up. have you checked your oil filter just to see if any metal is in it?

 

[Dsmkauai]

Post a video of what its doing!! All you will get is guesses if you don't couldn't be anything bro! Its definitely not good if its doing the same thing before and after rebuild! Sounds like its suspension related like a hub bearing or bushing, if a fresh motor didn't fix anything!

 

[Jmmahon]

I would take the valve cover off and check all the lifters, I wouldn't trust someone guessing on here just by what you say. Take it off and check all the lifter and rocker arms for binding. Also do the fingernail check on the cam lobes. Look for deep gouges.
Hope it helps!