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Hey Eric, here's the procedure from the GM manual
Adjust valves when lifter is on base circle of camshaft lobe:
A. The engine should be in the #1 firing position. This may be determined by placing fingers on the #1 rocker arms as the engine assembly timing mark on the torsional damper aligns with the crankshaft position sensor bolt located on the front cover. If the valves are not moving, the engine is in the #1 firing position. If the valves move the engine is in the #4 firing position and should be rotated one revolution to reach the #1 position.
B. With the engine in the #1 firing position, the following valves should be adjusted
Exhaust-1, 2 3
Intake-1, 5, 6
C. Tighten the adjusting njt until there is zero lash + 1-1/2 turns
(This can be determined by rotating pushrod while turning adjusting nut). When lash has been removed, turn adjusting nut in 1-1/2 additional turns (to center lifter plunger)
D. Crank the engine one crankshaft revolution. This is the #4 firing position. With the engine in this position, the following valves should be adjusted to zero lash + 1-1/2 turns
Exhaust-4, 5, 6
Intake-2, 3, 4
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