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Hi...sorry for delayed response. Havent got to work on the car very much due to other customers priorities. But the valve cover is off. Cams rotate in sync and all marks line up. Were going to pull timing cover and inspect lower timing system. Other than that...the heads got to come off...

I havent pulled the head to further inspect But im guessing 120 psi of shop air was enough to close the valves making me think the cylinder is sealed up good. But the slow build of psi from the piston during cranking isnt enough. Lobes look normal. Havent specd the shims with a feeler gauge...

Hey guys. Got a customers car here and were stumped. Figured you guys might be able to figure it out if you've ran across this before. 103k miles 0 psi compression. 30psi on cyl 4. Cranks fast like the plugs are out. Wet and dry test yield the same results. All 4 pistons are moving...