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Does any one here know what would cause the lifters on a 2000 4.0 to pump up enough to hold the valves open? new lifters-new heads-new oil pump-but no compression

okay-here's the deal-My cousin has a 2000 4.0 ranger that quit while driving down the road-a compression test showed it had less than 20 pounds of pressure so the heads were pulled and the exhaust valves were beat down in the head about 1/8 of an inch so the heads were sent to a machine shop and...