Unlock more power and RPM potential in your LS build with Michigan Motorsports' .550″ Lift Beehive Valve Spring and Seal Kit—a direct-fit performance upgrade that crushes stock spring limitations. Engineered for aggressive cam swaps and high-revving setups, these 1.250″ beehive-style springs handle lifts up to .550″ while maintaining superior seat pressure and valve control. Built as a drop-in replacement for GM part #12713265, this kit includes 16 high-strength springs and premium hat-style valve seals with integrated spring locators to keep everything in check under heat and pressure. Whether you're building an LS street bruiser or dialing in a mild boosted combo, these springs deliver the performance, durability, and control your valvetrain demands—without the bulk or complexity of dual springs.