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Gmdod Z

 
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Gmdod Z
This diagram shows the difference between cylinder activation and deactivation in GM's new displacement-on-demand V-8. In the deactivated position, oil acts on a centrally-located release pin which collapses a spring, allowing the outer and inner lifter body to move independently. Although the lifter still accurately follows the cam lobe, the valve never opens. View Related Article
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