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JEGS Performance Products 514060

JEGS Performance Products 514060

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
      To order this item contact Customer Service at 1-800-345-4545.

    JEGS Performance Products 514060 Details

    290cc Intake Runner

    Material
    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"
    Accessories
    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)
    1.880"
    (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.

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