S&S Cycle Primary Cam Chain For Harley Big Twin Engineered for high-output Big Twin builds, this cam chain provides the strength necessary to support increased horsepower. Each link is made from heat-treated materials and precision machined to minimize stretch, ensuring stable engine timing under heavy loads. This essential component from S&S Cycle is vital for riders looking to extend valvetrain life and reduce maintenance intervals on performance motorcycles. Features: Direct OEM Replacement Increased Chain Life 11 Stronger Replaces OEM 25675-06