Compatible with:GM Small-Block V8 Engine series: LS1, LS2, LS6 Vortec 5300 L59LM7 LM4 L33 4.8L, 5.3L, 5.7L, 6.0L Buick Allure, LaCrosse, Rainier Cadillac Escalade CTS XLR Chevrolet Avalanche Camaro Express Silverado Suburban Tahoe SS SSR GMC Canyon Envoy Savana Sierra Yukon Pontiac Firebird Grand Prix GTO Replace Part Numbers: 10214664, 12681275, 12669993, MR-1341, 180-1337, R907M, G4400; 94199279(Bolt). Solve common problems: This kit provides a comprehensive solution to the common problems of cracks, wear, noise and loosening of the rocker arm Effectively extend the life of the engine, reduce maintenance costs, and let you drive with more peace of mind. High-performance upgrades: Manufactured with high-quality materials to ensure the durability and reliability of the rocker arm. Optimize the timing of the swingarm to significantly increase engine power, allowing your car to accelerate faster and more powerfully. After-sales service: Provide 180-day quality assurance, and a professional customer service team is ready to answer your product-related questions Rocker Arms Trunion Upgrade Kits 5.3 Performance Parts Compatible with GM Small-Block V8 Engine Series LS1 LS2 LS6 Vortec 5300 L59LM7 LM4 L33 4.8L 5.3L 5.7L 6.0L 10214664