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Message: [QUOTE="Zeb, post: 1521454, member: 30304"] I drilled and tapped a factory cap, so I’m seeing oil pressure in the filter housing. The bearings are definitely softer than the roller or the needle bearings. I think we need to look at this as not simply a pressure issue, but as a pressure/volume issue at the lifter. Geoff says if you look at the harmonics of a 6.0/6.4 cam lobe on a Cam Doctor, the lobe has a bump on it that shocks the lifter every time it comes around. He likens it to a tire hitting a pothole in the road. When we think of the lifter getting shocked over, and over, and over again, combined with less than optimal oil pressure/quantity/quality when idled excessively, we get to see the cumalative effect of this. This is why I think it is primarily a cam issue, but the cam isn’t the only issue. I think the solution to this problem, for most cases is, Motorcraft lifters, Motorcraft oil filter and cap, and a decent oil, changed at the correct interval. I tell guys if they’ll do this, they’ll wear the truck out before it needs lifters again! [/QUOTE]

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