Manley 11655B-4 Race Master 37.5mm Exhaust Valve for Volkswagen Aircooled

With a 37.5mm head diameter and 4.405-inch overall length, these valves are purpose-built for bracket racing, drag racing, and oval track competition in engines operating under 8,000 RPM.

Key Features:

• XH-426 Stainless Steel Construction: Premium exhaust-grade stainless alloy delivers exceptional heat resistance and long-term durability in high-stress applications
• Chrome Stems and Hard Tips: Hard-chromed stems and hardened tips resist wear and extend service life, eliminating the need for lash caps in most applications
• Swirl Polished Underhead Area: Precision swirl polish beneath the valve head enhances airflow and combustion efficiency
• Fully Machined Combustion Face: CNC-machined seating surface ensures consistent, leak-free seating and optimal combustion chamber geometry
• Straight Stem (Race Master) Profile: Classic straight-stem design suited to a wide range of racing engine configurations
• Recommended for Alcohol Engines: An ideal exhaust valve choice for engines running alcohol-based fuels

Specifications:

• Head Diameter: 37.5mm
• Stem Diameter: 0.313 in.
• Overall Length: 4.405 in.
• Tip Length: 0.17 in.
• Valve Type: Exhaust
• Material: XH-426 Stainless Steel