Manley 11133-1 Race Series Stainless Steel Exhaust Valve Sport Compact

The Manley 11133-1 is a Race Series stainless steel exhaust valve engineered for Sport Compact applications. Built from Manley's proprietary Race Series alloy and manufactured to exacting quality standards, this individual exhaust valve is designed to outflow and outperform in even the most demanding high-performance environments.

Key Features:

• Race Series alloy construction — Manley's high-grade stainless steel formulated for strength and durability under extreme heat
• Chrome-plated stems — Durable, corrosion-resistant finish for long service life
• Swirl-polished underhead — Improved airflow characteristics for maximum engine breathing efficiency
• Fully hardened tips — Resists wear from rocker arm and follower contact over extended use
• Completely machined combustion faces — Precision-finished for optimal sealing and heat transfer
• Closely controlled margin heights — Ensures consistent performance across all cylinders
• Exact stem-to-seat concentricity — Precision tolerances deliver a superior valve-to-seat seal

For applications operating under extreme boost pressures, Manley also offers select valves in their Extreme Duty exhaust alloy — a proprietary blend engineered for superior hot hardness and high-temperature strength, making it ideal for setups where exhaust gas temperatures reach extreme levels.

Manley Race Series stainless steel exhaust valves are suitable for the full spectrum of performance builds — from mild street-driven vehicles to competition-level builds producing 1,000+ horsepower on the drag strip or at drifting events. Sold as an individual piece.