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Message: [QUOTE="tbsimmons, post: 1136104, member: 2026"] From what was said above about a lot of your lifters collapsing sticks out to me. I can see a one off but many. I would bet that part of the problem is oil pressure in the top end. No pressure hydraulics don't work. Collapse the lifter. Valve doesn't open. More fuel. Exhaust doesn't leave. More fuel. Burn piston and tear rings up. My theory at least. I am sure they will but whoever checks your engine I would check the oil galleys for the cam and lifters. After the rebuild I would put a manual pressure gauge in a port at the top end if you can just to double check it. Eric just for example I have ran hydraulics on cars with much more seat pressure than what springs I have read about for the 6.4 heads and .570+ lift at the valve. Hydraulics are fine. Sent from the bat phone near a drilling rig. [/QUOTE]

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