Manley 11351-8 Severe Duty Exhaust Valve 1.600in Head +.200in Length XH-428 Stainless

The Manley 11351-8 is a Severe Duty Series stainless steel exhaust valve featuring a 1.600" head diameter and an installed height that is +.200" longer than stock. Machined from Manley's proprietary XH-428 stainless steel, this exhaust valve delivers double the ultimate tensile strength at elevated temperatures compared to competing offerings, making it a top choice for high-performance street, bracket, drag, and oval track applications.

Key Features:

• Head Diameter: 1.600"
• Stem Diameter: 0.3110" (5/16")
• Overall Length: 5.140" (+.200" longer than stock)
• Tip Length: 0.290"
• Underhead Angle / Radius: 15° x 1/2"
• Margin: 0.080"
• Seat Width: 0.100"
• Top of Head: 9° Dish
• Weight: 95 grams per valve
• Material: XH-428 Severe Duty Stainless Steel
• Chrome stem and hardened tip for superior wear resistance
• Swirl polished underhead area for reduced drag and improved flow
• Fully machined combustion face for precise sealing

Manley's Severe Duty Series represents the pinnacle of their stainless steel valve lineup, engineered to withstand the extreme combustion pressures, high temperatures, and aggressive cam profiles found in naturally aspirated, forced-induction, and nitrous-fed racing engines. Valve guides should be checked and correctly sized prior to installation to achieve proper stem clearances.