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1. Bring No. 1 cylinder to firing position and align the timing marks on the front cover and harmonic balancer. You can make sure the distributor is set correctly at this time. Adjust exhaust valves on cylinders No. 1, 2 and 3 by backing off the rocker arm nut until you can just spin the push rod.
2. Tighten the rocker arm nut until the pushrod just stops spinning with your fingers and then tighten the rocker arm 1 ½ turns. Repeat adjustment on intake valves for cylinders No. 1,5,and 6.
3. Turn the crankshaft one revolution and line up the marks on the balancer and the timing cover again. This will be No. 4 cylinder firing position. Adjust the exhaust valves on cylinders 4, 5, and 6. Adjust the intake valves on cylinders No. 2,3, and 4.

 

Expert:	RussMasterTech
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Answered:	4/28/2008

ASE Certified Technician

19 years of GM Dealership experience. ASE Master with L1 and GM Master Certified in Electrical