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ProMaxx Performance 317 Series Aluminum Cylinder Heads Big Block Chevy

ProMaxx Performance 9318
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ProMaxx Performance 317 Series Aluminum Cylinder Heads Big Block Chevy $1,475.99
317 Series Aluminum Cylinder Heads
  • Big Block Chevy
  • As-Cast
  • 317cc Intake Ports
  • 119cc Combustion Chamber
  • 2.25'' Intake / 1.88'' Exhaust Valves
  • 7/16'' Rocker Arm Studs
  • .600'' Max Lift
  • Steel Retainers
  • Assembled, 2/pkg

  • ProMaxx heads have started a revolution in the performance world. They have custom designed a head to meet the demands of the Big Block Chevy world, while keeping the quality high and the price reasonable. These BB-Chevy heads come in an As-Cast series or Full CNC-Ported series. The As-Cast series features ''as-cast'' runners and combustion chambers with hand blended valve bowls. The Full CNC-series heads have professionally machined ports and combustion chambers that flow and perform as good as or better than some of the best cylinder heads in the industry. Basic components include U.S. made bronze valve guides, and ProMaxx 5-angle valve job. Assembled heads include 21-4N stainless valves, springs, retainers, 7/16'' rocker studs, guide plates, and viton seals (Bare heads do not include these items).


    • A356-T6 Aluminum Castings
    • Efficient Chamber Design
    • 5-Angle Competition Valve Job
    • Diamond-Honed Bronze Guides
    • Available with As-Cast or Full CNC'd Ports and Chambers
    • Sold in Pairs, 2/pkg.

     JEGS Easy Kits are designed by JEGS high performance racing professionals to help you get all the performance parts you need for your race car, hot rod or truck.

    can they take a 600 lift roller cam in a gen 6 454

    Asked by: teto
    The maximum lift that the valve springs on this head can take is .600".
    Answered by: Rusty B
    Date published: 2018-06-06

    What arp head bolts will I need for promaxx 317 heads?

    Asked by: Mark 2238
    The BBC head bolts from ARP are #135-3603
    Answered by: Dean R
    Date published: 2018-02-10

    are these heads oval port or rectangular port ?

    Asked by: Ruben 396
    These are rectangular port heads.
    Answered by: Rusty B
    Date published: 2017-11-08

    Can I buy these heads with upgraded springs to come ready to support .650 or larger lift? If so how much extra is it?

    Asked by: Jakew
    These do not have a spring option available. They would have to be changed upon receiving them.
    Answered by: Jon Jegs Tech
    Date published: 2017-10-27

    Hi do these heads have a raised exhaust port or standard location?

    Asked by: runningwithscissors
    These heads have the exhaust port in the standard location.
    Answered by: Rusty B
    Date published: 2017-10-25
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    Some parts are not legal for use in California or other states with similar laws / regulations