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JEGS Performance Products 514060 - JEGS Big Block Chevy Cylinder Heads

JEGS Performance Products 514060 - JEGS Big Block Chevy Cylinder Heads

JEGS Performance Products#555-514060

Cylinder Head
  • Big Block Chevy
  • 290cc Intake Ports
  • 119cc CNC Ported Combustion Chambers
  • 2.250" Int./1.880" Exh. Valves
  • 1.550" Valve Spring, 0.650" Max Lift
  • 7/16" Rocker Studs
  • Assembled, Sold Individually

    JEGS Performance Products 514060 - JEGS Big Block Chevy Cylinder Heads Details

    290cc Intake Runner

    Casting A356-A Virgin Grade, Heat Treated to T-6
    Valve Guides Manganese Bronze
    Valve Seats Alloy, For use with Unleaded Gasoline
    Valve Train
    Rocker Stud Size 7/16"-24
    Guide Plates 3/8"
    Pushrods 3/8" Hardened, Must Check Length
    Spring Retainers Chrome Moly Steel (7 Degree)
    Valve Locks 7 Degree (HD)
    Spring Locator I.D. Locator - 1.570" x 0.060"
    Valve Springs
    Specifications Pressure
    Spring O.D. Type Max Lift Coil Bind Seat Load Open Load
    1.550" Single 0.650" 1.150" 130# @ 1.880" 350# @ 1.280"
    Spark Plugs 14mm x 3/4" Reach - Gasket Seat - 5/8" Hex
    Head Bolts * ARP 070-135-3603 or equivalent
    Head Studs * ARP 070-235-4103 or equivalent
    Stud Girdle JEGS 555-20518 or equivalent
    Rocker Arms Standard Big Block Chevy for 7/16"-24 Stud
    Head Gasket JEGS 555-210142 or equivalent
    Accessory Bolt Locations Stock Placement
    Flow Specifications
    Flow Graph Intake Exhaust
    Port Volume 290cc 140cc
    Valve Diameter 2.250"
    (Stainless Steel)
    (Stainless Steel)
    Valve Length 5.340" 5.350"
    Valve Stem Diameter 11/32" 11/32"
    Valve Stem Seal Diameter 0.530" (Teflon) 0.530" (Teflon)
    Port Dimension 2.325"H x 1.625"W 1.780"H x 1.950"W
    Flow Rate 378 CFM @ 0.700" Lift (28" H20) 265 CFM @ 0.700" Lift (28" H20)
    Gasket JEGS 555-210100
    or equivalent
    JEGS 555-210151
    or equivalent
    Torque Specification
    Rocker Studs 45 ft/lbs.
    Manifold Bolts 35 ft/lbs.
    Head Bolts or Studs Per Manufacturers Specifications
    * Requires 4 longer bolts or studs over each exhaust port which are included in the recommended kits. The longer bolts and studs can also be purchased separately.

    JEGS Performance Products 514060 - JEGS Big Block Chevy Cylinder Heads

    Racing technology for your high performance street engine! Our heads are cast from Virgin A356 Aluminum and heat treated to a T6 Hardness for the ultimate quality and durability. They are then machined on the latest CNC machines for accuracy and precision. We use the most up to date technology to design our intake and exhaust runners and combustion chambers for maximum performance. Our choices of intake runner volumes, combustion chamber sizes, spark plug styles and valve spring sizes insure that we have a cylinder head to suit your needs. Our cylinder heads are assembled with premium parts such as manganese valve guides, stainless steel valves and chrome-moly retainers. They feature valve seats that are compatible with unleaded fuel.

  • Cast in the U.S.A.
  • Machined in the U.S.A.
  • Assembled in the U.S.A.
  • 3-Angle Competition Valve Job
  • Improved Combustion Chamber Design For Improved Efficiencies
  • Latest In Port Design For Both The Intake and Exhaust For Increased Horsepower and Torque
  • Exhaust Ports Raised .300"
  • Premium parts and hardware
  • Up to 20 lbs. lighter per head than standard cast iron heads

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