QA1 Low Friction Upper Ball Joint - 4-Bolt Style - GM Mid-Size Aluminum Cylinder Heads If your rules require a

If your rules require a "steel bodied shock

492 in Bore

11/16 in 12 Point Head

Braided Fire Retardant Fabric / PTFE

QA1 Low Friction Upper Ball Joint - 4-Bolt Style - GM Mid-Size Aluminum Cylinder Heads If your rules require aQA1 has now utilized this technology in ball joints designed and engineered exclusively for high perfomance racing applications. This completely revolutionary ball join design will rock the racing world! For the ultimate in low friction operation (0 ft. lbs breakaway torque!) and the most wear resistant design, look nor ruther than QA1. QA1's patented ball joints feature the following: Ultimate Low Friction Operation o Infinite preload adjustment