LS Valve Seal Kit

The LS Valve Seal Kit by Brian Tooley Racing is a precision component set engineered for LS engine builders and performance mechanics who demand OEM-quality sealing without compromise. As an LS platform enthusiast, you know that valve stem seals are critical for controlling oil consumption and maintaining ring seal integrity during high-RPM operation. This set of 16 seals addresses the exact wear points that emerge in high-mileage or modified LS heads, preventing blowby and oil burning that degrades performance and fouls spark plugs.

Each seal in the LS Valve Seal Kit features a 0.313-inch valve stem diameter with a 0.546-inch outer diameter, sized precisely for standard LS cylinder head applications. The seals are manufactured from Viton elastomer—a fluorocarbon material chosen for its thermal stability and resistance to engine oils, coolant, and fuel vapors. Viton maintains elasticity across the 200°F+ temperature swings typical of modern LS engines, preventing the hardening and cracking that compromise inferior rubber compounds. This material choice extends seal life and reduces the risk of oil seepage past the stem during sustained high-load or boosted operation.

Whether you're refreshing a stock LS3 head, rebuilding a 5.3L after extended towing, or assembling a street or strip engine build, the LS Valve Seal Kit provides the reliability needed for long-term durability. Installation requires head removal and valve seat work—a task suited to experienced engine builders or professional machine shops. The set of 16 seals covers all intake and exhaust valve positions on a standard LS engine, making it an economical choice for complete seal replacement during any cylinder head service or rebuild.