LowPricedAutoParts Premium Viton Positive-Metal Clad Valve Stem Seal (3/8" Stem, .625" Guide) - Fits Ford 429 Medium Duty Trucks GM 8.1L 20-Pack

Keep your Ford medium-duty truck or GM 8.1L heavy-duty 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 3/8", Guide OD .625", Seal OD .737", Length .530") are precision-engineered for Ford 429 big block engines in 1980–1998 medium/heavy duty trucks (including F-600, F-700, F-800, B-700, C700/C800, LN/LNT/LT series) and GM 8.1L Vortec V8 applications in 2001–2007 models such as Chevrolet Silverado 2500/3500 HD, Suburban 2500, Express 3500, Avalanche 2500; GMC Sierra 2500/3500 HD, Yukon XL 2500, Savana 3500. These big bore V8 powerplants delivered exceptional torque for towing, hauling, commercial work and heavy-duty tasks when properly maintained. Over years of service, original valve stem seals can harden, crack or wear from heat cycling, oil exposure, high loads & extended mileage – leading to increased oil consumption, blue exhaust smoke, fouled plugs, carbon buildup on valves or guide damage that impacts performance, emissions & engine longevity in work trucks & fleet vehicles. This premium Viton replacement effectively corrects those concerns, featuring positive-metal clad construction for secure guide retention and Viton compound for excellent heat, oil & wear resistance in demanding heavy-duty conditions. The 20-pack bulk format is ideal for complete head jobs, shop inventory or multiple fleet repairs. Installation during valve or head service: Clean valve guides and stems thoroughly, inspect for scoring (replace guides if worn), lightly lubricate, use appropriate 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 & to address any related valve/guide issues. At LowPricedAutoParts, customer service is our top priority. Send us your VIN, exact year/model/engine/head details or any fitment questions – our knowledgeable team responds quickly to confirm compatibility & provide personalized guidance. Shop with confidence knowing these premium Viton valve stem seals are backed by our dedication to quality parts & exceptional support. We're here to help get your Ford F-700, GM Silverado HD or similar heavy-duty truck sealed tight, running clean & ready for the job – contact us today!

• Premium Viton positive-metal clad valve stem seals (Stem Size 3/8", Guide OD .625", Seal OD .737", Length .530") – engineered for Ford 429 big block & GM 8.1L Vortec engines; fits 1980–1998 Ford medium/heavy duty trucks (F-600/F-700/F-800 series) & 2001–2007 GM 8.1L applications including Silverado/Sierra HD, Suburban/Yukon XL 2500, Express/Savana 3500; always verify your VIN, head specs & guide OD for exact match on these heavy-duty work trucks
• High-temperature Viton material with metal clad reinforcement ensures superior oil sealing & long-lasting durability – controls valve guide oil consumption, reduces blue exhaust smoke & extends valve life in big bore V8 engines exposed to heavy loads, heat & extended service intervals
• Positive-metal clad design provides secure guide retention & precise stem alignment – prevents excess oil entry while maintaining proper lubrication; ideal for head rebuilds, valve jobs or addressing consumption in Ford medium duty & GM 8.1L trucks used for towing, hauling & commercial applications
• 20-pack bulk quantity supports full engine service or shop stocking – cost-effective for fleet mechanics, heavy-duty restorers or owner-operators maintaining these robust big block & Vortec powerplants known for torque & reliability when properly sealed
• Professional installation recommended: Clean guides/stems thoroughly, inspect for wear (replace if grooved), lube lightly, press seals into guides with proper tool, ensure full seating & clearance; torque rockers to spec & monitor oil use/smoke after break-in
• LowPricedAutoParts puts an emphasis on customer service – send your VIN, year, model, engine details, head casting or photos for quick fit verification; our team is committed to exceptional support & helping you get the right premium Viton seals with confidence