2000 Cadillac Escalade No compression

Hi
Try this back off rockers so your sure valves are seated. Is there compression? If so instead of adjusting At tdc and do ext so and so then int, so so. Start at TDC cyl 1 then rotate as to firing order. Tighten while rotating push rod with finges when there is resistence add 1/2 more turn.
Let me know
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What I would do first is set them all at zero lash when valves are closed, and check a cylinder to see if it has compression. The procedure calls for one full turn after zero, but we want to know if zero lash gives you some squeeze. If you still don't have compression at zero lash, were the heads serviced? At that point you would want to consider a cylinder leakdown test to find out where your air leak is. I included the GM procedure, but it would not be the first time that service info was incorrect.

Here is the gm procedure:

Valve Clearance Adjustment

Turn the valve rocker arm nuts clockwise until all of the valve lash is removed.
Turn the crankshaft clockwise until the alignment mark on the crankshaft balancer is aligned with the notch in the engine front cover tab.
Look at the number 1 cylinder valves as the crankshaft balancer alignment mark approaches the notch in the engine front cover tab. If a valve moves as the alignment mark moves into position, the engine is in the number 6 firing position. If this happens, turn the crankshaft clockwise 1 revolution in order to reach the number 1 cylinder firing position.

With the engine in the number 1 firing position, adjust the exhaust valves for cylinders number 1, 3, 4, and 8 and the intake valves for cylinders number 1, 2, 5, and 7.
4.1. Turn the valve rocker arm nut counter clockwise until the valve lash is felt in the valve pushrod.

4.2. Turn the valve rocker arm nut clockwise until all the valve lash is removed.

Zero valve lash can be felt by moving the valve pushrod up and down between your thumb and forefinger until there is no more up and down movement of the valve push rod.

4.3. When all the valve lash is removed, then turn the valve rocker arm nut clockwise 1 additional turn (360 degrees).

Turn the crankshaft clockwise 1 revolution until the alignment mark on the crankshaft balancer is aligned with the notch in the engine front cover tab.

With the engine in the number 6 firing position, adjust the exhaust valves for cylinders number 2, 5, 6, and 7 and the intake valves for cylinders number 3, 4, 6, and 8.
6.1. Turn the valve rocker arm nut counter clockwise until the valve lash is felt in the valve pushrod.

6.2. Turn the valve rocker arm nut clockwise until all the valve lash is removed.

Zero valve lash can be felt by moving the valve pushrod up and down between your thumb and forefinger until there is no more up and down movement of the valve push rod.

6.3. When all the valve lash is removed, then turn the valve rocker arm nut clockwise 1 additional turn (360 degrees).

When you consider what you are trying to do by turning it past zero lash, putting the lifter in the center of it's travel, it makes no sense why it is holding valves open. Theoretically, higher than normal oil pressure, would create this condition. I am assuming that both the half turn, and quarter turn results in no compression as well? Are you sure you are adjusting them with the valve in a closed position as described in the procedure?

Set them at zero lash and run it, see if there is any noise. If you can run it with the covers removed, you can make fine adjustments to diminish the rockers from clicking.