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How do i adjust the valves on 81 chevy 350 - Chevy Chevrolet Cars & Trucks

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First, remove the valve covers. turn the engine over by hand until #1 comes up on Top Dead Center. #1-3-5-7 is the driver's side front to back and 2-4-6-8 is passenger side front to back. As the timing mark on the bottom pulley nears the 0 mark on the timing tab the valves on #1 should nor be moving. This is #1. If they are moving then you are coming up on #6 and the engine should be rotated one complete turn to reach #1.
With the engine on #1 you can adjust #1-3-4-8 on the exhaust and #1-2-5-7 on the intake. Back off the adjusting nut until lash is felt at the push rod and then turn the nut back in until the play is just removed. Then give the nut 1 full turn in.
Rotate the engine 1 complete turn again to bring it up to the #6 position.Make sure the timing mark is lined up with the 0. You can now adjust #2-5-6-7 on exhaust and #3-4-6-8 on the intake.
Hope this helps.

Posted on Mar 13, 2011

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