I have seen that as well. Fixing this problem is quite tricky, but you have to address it correctly. I would honestly stop with all of the additives and oil flushes and go straight to replacing the lifters. Yes, its a PITA cause you have to remove the heads, but at that time (once the lifters are removed) you can look down the lifter bores to the cam and see if the cam lobes have excessive wear. To do so, remove heads, lifters, and lifter trays--then turn the crank so the cam spins--and use a flashlight to look down each lifter bore to inspect the cam lobes. They should be fine, but I have seen a lifter go bad, have the roller bearing on the bottom of the lifter mushroom, and flatten a cam lobe.
A lifter COULD break apart, so I would go ahead and replace them right now and not jack around with anything else.
Originally Posted by txarkitekt
I have seen that as well. Fixing this problem is quite tricky, but you have to address it correctly. I would honestly stop with all of the additives and oil flushes and go straight to replacing the lifters. Yes, its a PITA cause you have to remove the heads, but at that time (once the lifters are removed) you can look down the lifter bores to the cam and see if the cam lobes have excessive wear. To do so, remove heads, lifters, and lifter trays--then turn the crank so the cam spins--and use a flashlight to look down each lifter bore to inspect the cam lobes. They should be fine, but I have seen a lifter go bad, have the roller bearing on the bottom of the lifter mushroom, and flatten a cam lobe.
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