Viton Valve Seals - 3/8 Steel Body .500

The Viton Valve Seals - 3/8 Steel Body .500 by COMP CAMS represent a precision engine component designed for high-performance and stock rebuild applications. These positive-stop valve stem seals are engineered to prevent oil from seeping past the valve guide while maintaining proper lubrication of the guide bore itself. Whether you're restoring a classic engine, upgrading a performance build, or performing routine valve train maintenance, quality valve seals are essential to controlling oil consumption and extending engine life.

These seals feature a steel body construction paired with Viton elastomer material—a premium fluorocarbon compound that resists heat, fuel, and chemical degradation better than conventional rubber. The 3/8-inch valve stem diameter and 0.500-inch guide bore specifications ensure a precise fit on compatible cylinder heads, while the positive-stop design prevents over-compression and seal damage during installation. The set of 16 units accommodates complete valve train coverage on most V8 and multi-cylinder engines, minimizing the need for multiple purchases during a full rebuild.

Engine builders, professional technicians, and DIY enthusiasts rely on COMP CAMS valve seals for their durability and consistent performance across both street and competition engines. Proper installation requires careful alignment over the valve stem and guide bore; many builders prefer to install seals on a dedicated seal installation tool to prevent premature twisting or damage. Before ordering, verify your cylinder head's valve stem and guide bore dimensions to ensure compatibility—these specifications are critical for achieving an effective seal and preventing oil burning issues.