Enginetech S357P-20 Valve Stem Seal Positive Exhaust 8mm Viton

The Enginetech S357P-20 is a positive valve stem seal designed specifically for exhaust valve applications. This high-quality seal features an 8mm stem diameter and is constructed from Viton fluoroelastomer material for superior heat and chemical resistance in demanding exhaust environments.

Key Features:

• Positive seal design ensures consistent valve guide lubrication while preventing excessive oil consumption
• Viton construction withstands extreme exhaust temperatures and resists degradation from combustion byproducts
• 8mm valve stem diameter for precise OE-equivalent fitment
• Exhaust valve application with .020" oversize specification
• Engineered to OE specifications for reliable performance and proper sealing

Valve stem seals are critical components that control oil flow to the valve guides, preventing oil from entering the combustion chamber while ensuring adequate lubrication. The Viton material used in this seal provides exceptional durability and longevity compared to standard rubber compounds, making it ideal for high-performance and rebuilt engine applications.