If you have any doubt, replace them. If the engine is running, you can pull a rocker cover and see if you can find a noisly lifter by slipping a thick feeler gauge between the valve and the rocker while the engine is running. If that significantly changes the sound of the noisy lifter, it's probably bad and you should replace it. Once the engine is torn down, just replace any lifter that's suspicious. Many people replace them every time they tear the engine down.
It has adjustable rockers.
It has adjustable rockers.
no
put the lifters up rite in a can of motor oil and let them sit for 30 mins
yes like 350 engine
That would be zero valve lash. You only use a feeler gauge on solid lifters.
pull the cam and lifters
Exhaust leaks, bent pushrod
It's not recommended to change just the lifters. The cam and lifters should be replaced together. To get at the lifters, you can remove the rocker covers and intake manifold, loosen the rockers enough to get the pushrods out, then pull out the lifters.
It means the lobe is worn off of the CAM SHAFT. Need to replace cam and lifters.
The most common cause of lifters knocking is low oil pressure.
perhaps the rockers aren't adjusted properly.