COMP Cams – XD-A 7.740 to 7.972″ Adjustment Range Pushrod and Shim Kit

GM LS XD-A™ Adjustable Pushrod

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 adjustedover 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.

COMP Cams XD-A 240-Piece Pushrod Shim Kits

COMP designed their XD-A adjustable pushrods with a top section that slides 2 in. inside a wider bottom section, with one or two shims captured in-between. These COMP Cams XD-A 240-piece pushrod shim kits allow the pushrods to be adjusted over a range of 0.172 in. in 0.004 in. increments. Kit includes 16 of each size thickness.

Includes:

* 16 shims that are 0.060 in. thick
* 16 shims that are 0.064 in. thick
* 16 shims that are 0.068 in. thick
* 16 shims that are 0.072 in. thick
* 16 shims that are 0.076 in. thick
* 16 shims that are 0.080 in. thick
* 16 shims that are 0.084 in. thick
* 16 shims that are 0.088 in. thick
* 16 shims that are 0.092 in. thick
* 16 shims that are 0.096 in. thick
* 16 shims that are 0.100 in. thick
* 16 shims that are 0.104 in. thick
* 16 shims that are 0.108 in. thick
* 16 shims that are 0.112 in. thick
* 16 shims that are 0.116 in. thick