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Mdmp 1205 013 Rocker Arms And Adjustable Valvetrain Geometry
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9 This graphic from Comp Cams shows a profile view of your typical rocker arm, pushrod, and valvespring configuration. This allows us to easily see where there can be critical contact points with the various parts. You want to be sure you have at least 0.030-inch clearance between the rocker arm and the retainer at all lift points to prevent hitting the retainer, which can cause retainer/lock failure and a dropped valve. You also want 0.030-inch clearance between your retainer and valve stem seal; otherwise the retainer will tear your seal and cause oil consumption issues.
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