GSC 2021-8 29mm Std Exhaust Valves Set of 8 for 4B11T & Sport Engines

Vehicle Fitment

• Mitsubishi Lancer Evolution X / 4B11T turbo engines (standard exhaust valve application)
• Additional sport compact turbo engines using 29 mm standard exhaust valves (check application guide)
• Performance engines where OEM 29 mm exhaust valves are specified
• Universal fit for applications with matching head diameter and valve seat geometry

Features

• Set of 8 high-quality exhaust valves from GSC Power-Division
• 29 mm standard head diameter matched to OEM spec for 4B11T engines
• Chrome-polished stems for reduced friction and enhanced guide wear resistance
• Swirl-polished and back-cut heads for improved exhaust flow dynamics
• Modified 23-8N stainless steel material for strength and durability
• Optimized head design reduces valve face distortion under load
• Valve tip heat treatment improves wear resistance and service life
• Designed for high-boost and high-RPM performance engines

Specifications

• Brand: GSC Power-Division
• Part Number: 2021-8
• Valve Type: Exhaust
• Head Diameter: 29 mm (standard size)
• Material: Modified 23-8N stainless steel
• Quantity: Set of 8 valves
• Finish: Chrome-polished
• Application: Designed for performance turbo engines with matching valve size

Included Components

• 1x Set of 8 exhaust valves (standard 29 mm)
• Note: Valve springs, retainers, seals, and keepers are not included

Product Description

The GSC Power-Division 2021-8 exhaust valve set includes eight standard 29 mm head diameter valves engineered for performance engines such as the Mitsubishi 4B11T turbo found in Evo X platforms. Crafted from modified 23-8N stainless steel with chrome-polished stems, these valves reduce friction in the guide area and improve durability under high heat and high RPM conditions. Swirl-polished and back-cut heads are designed to optimize exhaust flow for quicker response and stronger performance.

These exhaust valves offer a reliable upgrade to OEM components for sport compact turbo engines where the 29 mm standard diameter is specified. They are ideal for high-boost builds, performance tuning, and racing applications. Professional installation with proper valve springs and retainers is recommended to maximize performance and ensure correct valvetrain geometry. Valves sold as a set of eight; additional components like seals and keepers are typically acquired separately.