Keep your classic Ford or GM vehicle running clean and strong with this premium Viton positive-metal clad valve stem seal 20-pack from LowPricedAutoParts – the retailer of automotive parts and accessories that puts an emphasis on customer service. These seals (Stem Size 11/32", Guide OD .500", Seal OD .602", Length .433") are engineered for a vast range of vintage applications, including Ford 2.3L/2.5L/3.9L/4.7L/5.0L/5.8L/7.5L; GM/Chevrolet 2.5L/3.1L/3.8L/4.1L/4.3L/5.0L/5.7L/6.6L/7.0L/7.5L and similar engines in cars, trucks and high-performance builds from the 1950s through 1990s. These iconic OHV powerplants powered muscle cars, daily drivers, trucks and classics with robust torque and legendary durability when properly maintained. Over decades, original seals can harden, crack or wear from heat cycling, oil exposure and mileage – leading to excessive oil consumption, blue exhaust smoke, fouled plugs, valve guide damage or carbon buildup that shortens engine life in restored or still-running vehicles. This premium Viton replacement effectively resolves those issues, featuring positive-metal clad construction for secure guide retention and Viton compound for excellent heat, oil and wear resistance in demanding conditions. The 20-pack format is perfect for complete head jobs, shop inventory or multiple rebuilds. Installation during valve or head service: Clean valve guides and stems thoroughly, inspect for scoring (replace guides if worn), lightly lubricate, use installation tool to press seals into guides evenly, confirm full seating without damage, reassemble rockers/arms to factory specs, and monitor oil consumption/smoke during initial break-in. Professional assistance is recommended for precise fit, clearance and to address any related valve/guide concerns. At LowPricedAutoParts, customer service is our top priority. Message your VIN, exact year/model/engine/head details or any questions – our dedicated team responds quickly to confirm compatibility and offer personalized guidance. Shop with confidence knowing these premium Viton valve stem seals are backed by our commitment to quality parts and exceptional support. We're here to help get your Ford 302, GM 350, classic truck or muscle car sealed tight and running strong – contact us today!