GSC Power-Division STD Size Super Alloy Exhaust Valve for EVO X 4B11T

Low stock: 11

$296.33

$296.33 $296.33

Prop 65 Warning

This product can expose you to chemicals including Nickel, which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

GSC Power-Division Super Alloy Exhaust Valve for 4B11T

STD Size 29mm

For those running high horsepower, high EGT set ups that need a valve that will last in 2000°F conditions. The Super Alloy Exhaust valves have chrome polished stems to create a smooth, durable finish for added life and better lubricity, especially when paired with the GSC Manganese bronze valve guides. Strength, heat resistance, and performance are engineered into every valve. Under head dish is maximized for weight savings while swirl polished and backcut heads promote better air flow without sacrificing durability.

Product fitment
4B11T Evo 10 Dual Mivec

IMAGES ARE FOR ILLUSTRATION PURPOSES ONLY.

Valve Specification	Metric ( mm )	Imperial ( In )
Stem Diameter	5.5	-
Overall Length	105.85	-
Head Diameter	29.00	-

Exhaust Valves

GSC Power-Division performance valves are designed for high-output engines where material strength, precision manufacturing, and thermal durability directly impact reliability and performance. Produced from carefully selected premium stainless steel and superalloy materials, GSC valves are built to withstand the elevated temperatures, cylinder pressures, RPM levels, and combustion demands found in modern performance engines.

Every valve is manufactured to stringent dimensional and material standards to deliver precise fitment, consistent sealing performance, and long service life. Whether supporting naturally aspirated builds, high-boost turbo systems, endurance applications, or extreme horsepower race programs, GSC valves are engineered to handle conditions where lesser components reach their limits.

Frequently Asked Questions

What materials are GSC valves made from?

Depending on the application, GSC valves are manufactured from premium stainless steel or high-temperature super alloys designed to withstand extreme heat and cylinder pressures.

When should I upgrade to super alloy exhaust valves?

Super alloy exhaust valves are recommended for turbocharged, supercharged, nitrous, endurance racing, and other extreme applications where exhaust temperatures are elevated.

Are GSC valves compatible with OEM valve locks and retainers?

Many applications are designed to work with OEM-style locks and retainers, but compatibility should always be verified prior to installation.

GENERAL F.A.Q

Many GSC products, including our camshafts, are designed, machined, and finished in-house at our facility in South Carolina, USA. We maintain strict quality control throughout the manufacturing process.

GSC Power-Division has been serving the performance automotive industry for over 20 years, supplying racers, engine builders, tuners, and enthusiasts worldwide.

Yes. We sell directly through our website and also through an extensive network of authorized dealers and distributors worldwide.

GSC’s warranty covers defects in the product itself. Consequential damages, including engine damage, labor, towing, or vehicle downtime, are not covered.

Products used in racing or competition environments are subject to conditions outlined in our warranty policy. Performance applications inherently involve risks beyond normal operating conditions.