If you ever opened up a phaser and studied how it works in relation to the complete oil system all together you would see that there is a really big volume of oil in those chambers and you would know that it can only be vented so fast because of basically an orifice allowing it to empty at a certain speed, it can not "snap" back, it takes time for that oil to be vented from the phaser. The FACT is the needle bearing size on the lifter was significantly reduced in 2009 and so a smaller particle of anything can stop one from rolling just like how a penny on the floor in the grocery store can stop your buggy wheel from rolling and it will get a flat spot on the wheel that keeps getting worse as it stops intermittently and skids on the flat spot even more but a train wheel will just keep rolling over one like it wasn't even there. That's why the lifters fail and throwing more oil at it will not do anything to stop it.

I would love to see someone with actual spintron data backing up your claim. Maybe you worked there and couldn't figure this out and that would explain why they are still wiping lobes 15 years after the problem surfaced, if it was snapping back and causing this problem it would be super easy to solve with a computer software update to slow it down even more... Engineers really do some stupid stuff the ordinary everyday man can see is a huge problem but the engineer with his "special education" is clueless.

I don't see how VVT could cause lifter problems. All it does is move the camshaft a few degrees. It was likely a supplier or design change on the actual lifters that caused the issues.

all I know is what we found during the sprintron tests.

I can only go with what I've seen and that is starting in 2009 and up to 2011 or 2012 or whatever 5.7 engines are being destroyed because of valve train failures (mainly lifters) at a higher rate than the early models(03-08).
From what I recall the maintenance on cam and lifters is something like 40 or 50,000 mile replacement.

My 2007 Ram had 198,000 when I bought it and it was having misfiring/lifter clatter so within a couple months of buying I put a DIABLO tuner on it and disabled the mds. I've had the truck 8 years now and it runs really good considering it's pushing 250,000 miles.

the way I understand it,,, is the needle bearing on the roller is smaller than the superseded versions. Combined with lower oil pressure as these engines wear mixed in with less splash lubrication due to how the how the block is designed are all contributing factors , combined with lots of idle time

I put a scat pack / hellcat oil pump in mine while it was down for good measure.

I have 32-35 psi at 190ish degree hot idle and 55-60 psi driving down the road ( approx 2000 rpm range )

sorry, dont remember what pressures were before mine went south

Mine is all back together and runs like it did. I have serious doubts I';; put another 100k in my lifetime

The pump was made a higher volume in 2009... the same year the problem cropped up. The problem is the smaller needle bearing not the oil volume. There is the same area for lube to splash around in the 09+ block as there was before, combined with the higher pump volume there is MORE splash lube yet that is when the problem started and throwing even more oil around is not going to do anything. My 6.4 runs about that same pressure as yours but with a 5.7 pump even though it also has piston oil squirters to feed. Everyone buying high volume oil pumps is not accomplishing anything at all.

This may be very true, But I wasn't putting mine back together without a new oil pump. So it sure couldn't hurt.