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Severe Duty Exhaust Valve Big Block Chevy
Product Discontinued
MANLEYPART NUMBER: 660-11553-1

Severe Duty Exhaust Valve Big Block Chevy

Currently Unavailable

This product is no longer available. Please call customer service for assistance at 1-800-345-4545.

Exhaust Valves
  • 1.720'' Valve Diameter
  • 3/8'' Valve Stem Diameter
      • Severe Duty Exhaust Valve
    • Big Block Chevy
    • 1.720'' Diameter
    • 3/8'' (0.3715'') Stem Diameter
    • 5.354'' Overall Length (Stock)
    • Stainless Steel
    • 1/pkg.

    • Type: Exhaust Valve XH-428 Material
    • Head Diameter: 1.720'
    • Stem Diameter: 3/8' / 0.3715'
    • Installed Height: Stock
    • Overall Length: 5.354'
    • Tip Length: 0.220'
    • Underhead Angle / Radius: 10° x 3/8'
    • Margin: 0.065'
    • Seat Width: 0.100'
    • Top of Head: 6° Dish
    • Weight / Grams: 122
      The people at Manley really sweat the details on each and every one of their valves, from the affordable Budget Performance Replacement to the ultra-stout Severe Duty line. Chromed stems, hardened tip and swirl polished heads provide the performance advantage you expect from America's premier performance valve manufacturer.


      Budget Performance Replacement
      The perfect choice for a stock rebuild or mild performance use. Superior to OEM construction in every aspect.
      Street-Flo
      Chromed stems, hard water tips, swirl polished underhead areas, fully machined combustion faces and necked-down stems make these valves an excellent street/strip choise.
      Street Master
      Ideal for the street performance and bracket racer engine. Straight stemmed design provides extra meat for durability beyond belief. Holds up great to daily torture.
      Race-Flo
      For street performance or mild drag or circle track engines, these are a great choice. Race-Flo valves have necked-down stems for lighter weight and increased flow.
      Race Master
      For street performance or mild drag or circle track engines. Similar to Race-Flo valves, except straight stemmed.
      Pro Flo
      Pro Flo stainless steel valves were designed with hot street, drag and circle track engines in mind. Undercut design saves weight and provides up to 40% additional flow.
      Severe Duty
      Severe duty one-piece stainless steel valves are an excellent choice for applications where high spring pressures and high RPM's are common.

      Sold individually.

    Part TypeValve
    Product LineManley Performance Valves
    BrandMANLEY
    Package Height2.5
    Package Width2.5
    Package Length7.0
    Weight1.0 PG
    Part CategoryPerformance Parts
    Part FitmentSemi Universal
    Vendor Part Number11553-1
    Package Qty1
    Package TypeEA
    No Questions
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