Manley Performance is universally acknowledged as the leading manufacturer of performance and racing valves in the world. The reason for Manley’s overwhelming success is simple: QUALITY. We offer the best materials in the industry-exclusive materials our competitors do not possess. Our stems are hard coated with .0002" thick chrome rather than a few millionths of flash. Our hard tips are superior to competitors’ puddled satellites which can crack and erode off the stem. Our valve head and under head shapes have been at the forefront of the quest for improved flow since the late 1960s. And always each Manley valve has been price targeted to specific markets to ensure the best possible value to the customer.

Top Fuel and Funny Car drag racers, Big Block Chevy marine enthusiasts, and Small Block Chevy restricted carburetor circle track competitors will all benefit from the use of XtremeAlloy exhaust valves. Exotic steel is required simply because of the enormous heat imposed on the exhaust valves in these applications.

• Part: 11137-8
• Type: Exh.
• Head Diameter: 32mm
• Stem Diameter: 5.96mm/.2345"
• Installed Height: Stock
• O/A Length: 104.75mm
• Tip Length: 3.5mm
• Underhead Angle/Radius: 25° x 11/32"
• Margin: .060
• Seat Width: .100
• Top of Head: 20° Dish
• Quantity: 8