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Adding larger-diameter valvesprings requires checking the clearance between the rocker arm and the retainer before starting the engine. The underside of the rocker arm body should have at least 0.040-inch clearance from the retainer to the bottom side of the rocker arm for one full revolution of the engine. If there is contact (or a very close tolerance), a different-shape retainer, rocker-arm design, or added lash cap on the tip of the valve stem may afford the required clearance. View Related Article
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