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1988 Chevy W-Series
Fits Following Model(s):
  • 5.7L with Chevy Small Block 1 Generation Engines
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    Product Details

    Universal performance parts brand accessories

    Chevy W-Series 5.7L with Chevy Small Block 1 Generation Engines 1988-1991, Extreme Black™ Exhaust Valve by Howards Cams®. Engineered for high rpm and high horsepower applications. Extreme Black feature a gloss black nitride and are perfect for high temperatures (they run cooler which improves valve life), nitrous, turbo and supercharger applications. For naturally aspirated motors these valves will give you a much greater cylinder flow for good horsepower gains. They start as a one piece forged, high temperature, high nickel, stainless steel alloy. CNC finished to strict tolerances making these valves the choice for the most demanding race classes.

    Howards Cams


    Underhead Angle Or Radius: 12 Degree X .375
    Valve Finish: Cnc Machined
    Valve Head Style: 7 Degree Dish
    Valve Margin: .060
    Valve Material: Stainless Steel
    Valve Seat Width: .100
    Valve Series: Extreme Black
    Valve Stem Diameter: 11/32
    Valve Stem Style: Undercut
    Valve Tip Length: .250
    Valve Type: Exhaust


    • High nickel stainless alloy 1pc. forgings
    • Special black nitride process
    • Great for naturally aspirated applications
    • Great for nitrous applications
    • Great for turbo applications
    • Great for supercharged applications
    • Designed for high horsepower applications
    • Runs cooler, improves valve life
    • Fully CNC machined finished
    • Surface finish is smoother than chrome
    • Higher micro-hardness than stainless
    • Undercut stems for increased flow
    • Designed to unlock more performance out of your vehicle
    • Deliver a reasonable balance of strength and durability
    • Premium construction built with unmatched quality standards
    • Ensure smooth, reliable operation and long-lasting service
    • Painstakingly designed to meet your racing needs
    • State-of-the-art manufacturing technology
    • Made from the highest grade materials
    • Subjected to stringent quality controls
    • Proudly made in the USA

    The black nitride micro-hardness is higher than the stainless steel base material. No process can match it for surface hardness. Surface finish is smoother than with chromed stems, having less friction between stem and guide. The black nitride reduces power loss due to less valve-guide friction. Nitriding is not a coating, it is a process where it actually becomes part of the steel.

    If you’re serious about being number one on the track, be serious about Howards Cams®! Howard Cams stays at the forefront of the racing industry, offering you some of the most technically advanced and reliable performance parts on the planet. Established by Howard Johansen under the name Howards Power & Racing Equipment, the company started as a manufacturer of racing camshafts in 1945. In 1998, the company retooled its facility in Oshkosh, Wisconsin and changed its name to Howards Cams & Racing Components. With the new facility, Howards Cams expanded its product line to include precision forged steel connecting rods and crankshafts, billet main caps, and many other racing parts. Howard Cams uses the most advanced computer design software and the highest-grade materials to create parts that give a winning performance for years to come. Choose Howards Cams: leaving competition in the dust!

    Warranty Information

    Howards Cams products are covered by a limited lifetime warranty to be free from defects in material and workmanship from the date of purchase by the Original Purchaser. This warranty does not apply to any Products that have been subjected to misuse, mishandling, misapplication, neglect (including but not limited to improper maintenance), improper installation, or alterations.

    Magnuson-Moss Warranty Act:
    Legally, a vehicle manufacturer cannot void the warranty on a vehicle due to an aftermarket part unless they can prove that the aftermarket part caused or contributed to the failure in the vehicle (per the Magnuson Moss Warranty Act (15 U.S.C. 2302(C)) Learn More

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