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Manley Race Master Exhaust Valves Pontiac 400/428/455

Manley 11355-8
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Estimated to ship directly from the manufacturer on 08/20/18
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Manley Race Master Exhaust Valves Pontiac 400/428/455 $149.99
Race Master Exhaust Valves
  • Pontiac 400/428/455
  • 1.770'' Diameter
  • 11/32'' (0.3415'') Stem Diameter
  • 5.100'' Overall Length (Stock)
  • Stainless Steel
  • 8/pkg.

  • Manley 11355-8 Details

    Exhaust Valves

  • Type: Exhaust Valve XH-428 Material
  • Head Diameter: 1.770''
  • Stem Diameter: 11/32'' / 0.3415''
  • Installed Height: Stock
  • Overall Length: 5.100''
  • Tip Length: 0.250''
  • Underhead Angle / Radius: 25° x 3/8''
  • Margin: 0.080''
  • Seat Width: 0.100''
  • Top of Head: 20° Dish

  • Specifications:

    Manufacturer's Part Number:

    Manley Performance is indisputably a leading manufacturer of performance and racing components in the world. The reason for Manley's overwhelming success is simple: Quality. Manley offers the best materials in the industry - exclusive materials that other manufacturers do not possess. Manley's valve stems are hard coated with .0002'' thick chrome rather than a few millionths of flash. Manley's hard valve tips are superior to competitors' puddled ''stellite'' which can crack and erode off the stem. Manley's valve head and under head shapes have been in the forefront of the quest for improved flow since the late 1960's.

    Race Master, and the Pro Flo versions identified as Race Flo valves, are manufactured of XH-426 material for the exhausts and NK-842 for the intakes. This series of valves is targeted at the bracket, drag and oval track racers operating below 8000 rpm - above which engine speed titanium valves are generally required. Any engine builder successfully using EV-8 alloy (21-4N) valves will find in this series of Manley valves a superior piece at a most attractive price.

  • Stainless Steel (XH-426 Exhaust and NK-842 Intake)
  • Chrome Stems and Hard Tips
  • Swirl Polished and Fully Machined
  • Race Master (Straight Stem) and Race Flo Shapes Available
  • Recommended Exhaust Valves for Alcohol Engines
  • Intake Valves Feature the ''Race Flo/Pro Flo'' Shape for Improved Flow

  • Some parts are not legal for use in California or other states with similar laws / regulations