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The rocker-shaft end stands from Precision Oil Pumps provide support on both sides of the end rocker on each shaft. The factory stands do not provide this support, leading to frequent shaft failures with higher-than-stock spring pressures. The rockers are the factory adjustable units, and the pushrods are also factory 3/8-inch ball/cup units. This valvetrain is good to at least 6,500 rpm with a solid cam and spring pressures up to 400 pounds. View Related Article
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