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.
- For Use with Guideplates:
- Yes
- Pushrod Tube Diameter:
- 3/8-5/16 in.
- Pushrod Material:
- Chromoly
- Top Tip Style:
- Ball
- Top Tip Diameter:
- 5/16 in.
- Bottom Tip Style:
- Ball
- Bottom Tip Diameter:
- 5/16 in.
- Intake Overall Length (in.):
- 8.160-8.392 in.
- Exhaust Overall Length (in.):
- 8.160-8.392 in.
- One-Piece Pushrod:
- Yes
- Oiling:
- Yes
- Tapered:
- No
- Tip Attachment:
- N/A
- Wall Thickness (in.):
- N/A
- Heat-Treated:
- N/A
- Quantity:
- Sold as a set of 16.
- Universal:
- Yes
- Make:
- Chevrolet
- Engine Family:
- Chevy small block Gen III/IV (LS-based engines)
