Manley Severe Duty Valves - Intake - Head Dia: 2.250"/Stem Dia: .3415"/Inst Ht: Stock/O/A Length: 5.244"/Tip Length: .250"/Underhead Angle/Radius: 12 x 3/8"/Margin: .050"/Seat Width: .080"/Top Head: 7 Dish/Weight: 144G - (Set of 8)

Extensive tests conducted by Manley on their Severe Duty Stainless Steel Valves have determined the superior strength and fatique resistance of their XH-428 exhaust valves and NK-844 intake valves. Manley Severe Duty Valves are a preferred choice for extended use in highly modified circle track engines.

Manley Performance high performance and racing engine parts have been powering winners since 1966. Since our inception in March 1966, Manley Performance Products has been at the forefront of the high-performance automotive industry. Founded by gearhead Hank Manley shortly after his graduation from Brown University, our journey began with a deep passion for performance and racing, igniting a legacy that continues to thrive today. Our early offerings, including stainless valves, forged pistons, camshafts, and more, set the stage for innovation in the automotive aftermarket. From our humble beginnings, we’ve come a long way, and our commitment to quality and performance has remained unwavering. Over the years, we’ve proudly served legends of the racing world like Don Garlits, Bill Jenkins, and “Jungle Jim” Liberman. These partnerships defined an era and fueled our drive to push the limits of automotive excellence. Our journey has seen us expand, with state-of-the-art facilities in Lakewood, New Jersey, and Orange, California. We offer a constantly evolving product line that caters to modern markets like sport compact, Ford modular, and Chevy LS. We’ve also made our mark as an OEM supplier, earning accolades from industry giants like Ford. As we stride confidently into the future, Manley Performance Products remains committed to redefining excellence in a constantly evolving high-performance aftermarket industry. We invite you to explore our offerings, experience our passion, and join us on this exciting journey of innovation and power. Thank You for Choosing Manley. Enjoy the ride.

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