KIBBLEWHITE Exhaust Valve 70-4231

Exhaust valves endure extreme heat cycles and abrasive combustion byproducts—factory valves often become a bottleneck for flow and reliability. The KIBBLEWHITE Black Diamond™ Exhaust Valve (70-4231) eliminates that weak point with superior metallurgy and precision engineering, delivering consistent sealing and extended service life in high-performance applications.

Built from one-piece EV8 stainless steel forgings and finished with KIBBLEWHITE's proprietary multi-stage process, this valve resists corrosion, reduces friction, and maintains dimensional stability even under sustained high RPM operation. Whether you're building a race engine or rebuilding a high-mileage head, this is the valve that won't compromise your power.

• CNC machined, one-piece forging
• EV8 stainless steel construction
• Black Diamond™ friction-reducing coating
• Superior corrosion resistance
• Wear-resistant finish
• Made in U.S.A.
• MPN: 70-4231