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Our hydraulic cam allows use of inexpensive 1.5:1-ratio, OE, stamped-steel rocker arms. They aren't sexy but are proven stable at 6,500 rpm thanks to their 129.4-gram light weight and rugged design. For extra reliability we junked the used motorhome parts and went with new MP replacements for $82. Isky 31/48-inch-diameter adjustable chrome-moly pushrods allow gnat's-ass hydraulic lifter preload settings and compensate for deck and head material removal.