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XD-A Adjustable Pushrods

comp cams® introduces a game-changing method for accurately setting lash or pre-load while using non-adjustable-style rockers. the patent-pending xd-a™ adjustable pushrods incorporate a top section that slides two inches inside a wider bottom section, with one or two shims captured in-between. proven to 9,000-plus rpm in solid roller ls applications, the system provides a 90-percent increase in bending stiffness for enhanced valve train stability. it also allows for lightening of a rocker arm system by 30-plus grams on the backside by removing the adjuster and required support area for threads and seating. the use of lighter rockers (such as the comp cams® spr™ radius tip rocker arms) with xd-a™ adjustable pushrods allows higher rpm to be achieved by creating a much more dynamically stable valve train system.

the pushrods are designed especially for engines with low-mass rocker arms and a light valve train with drop-in fitment in ls engines. they can be adjusted over a range of .172" in .004" increments with shims, sold in sets of 16 by thickness or as a 240-piece set containing all available thickness options. top sections are available in 0/200" increments for coarse adjustment and work with hydraulic and solid roller camshafts. available for gm ls engines with more popular applications coming soon.

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