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Cylinder Head Kit for GM LS3 Engines [w/Head Bolts]
InfoVehicle Info Needed
JEGSPART NUMBER: 555-514050K

Cylinder Head Kit for GM LS3 Engines [w/Head Bolts]

$1,84520
5 left in stock
ShippingShips on Oct 19, 2026
Lowest PriceLowest Price Guarantee

Rectangular Intake Ports
Cylinder Head Kit
  • GM LS3 Engines
  • Includes:
    • (2) Cylinder Heads
    • (2) MLS Cylinder Head Gaskets
    • Cylinder Head Bolt Kit
    • Valve Cover Seals
    • Intake Seals

      JEGS 555-514050K Cylinder Head Kit Includes:

      • (2) JEGS Cylinder Heads for GM LS3 Engines, As-Cast 260cc Intake Runner - 555-514050
      • (2) JEGS MLS Cylinder Head Gaskets for GM LS Engines - 555-210840
      • (1) JEGS Cylinder Head Bolt Kit for 2004-2014 GM LS Engines - 555-83408
      • (1) JEGS Valve Cover Seals for GM LS Engines, Pair - 555-210870
      • (1) JEGS Intake Seals for GM LS3 Engines, Set of 8 - 555-210801

    Emissions Note:

    This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

    CLICK THIS LINK FOR IMPORTANT CARB & EPA EMISSIONS INFORMATION ABOUT THIS PART

      • Fully Assembled to Upgrade Your LS

      JEGS LS Aluminum Cylinder Heads are the perfect replacement or upgrade for your LS-based engine. Starting with a new aluminum casting these heads are fully assembled with all new components including intake valves, exhaust valves, valve springs, retainers, guides, and seats. They are available in cathedral port and rectangular port designs to match your GM LS Engine needs.

    Part TypeCylinder Head
    Product LineJEGS GM LS Aluminum Cylinder Heads
    BrandJEGS
    Part CategoryPerformance Parts
    Cylinder Head MaterialAluminum
    Intake Port LocationStandard
    Exhaust Valves IncludedYes
    Locks IncludedYes
    Engine Make/SizeGM LS3
    Retainers IncludedYes
    Intake Port ShapeRectangular
    Guideplates IncludedNo
    Rocker Arms IncludedNo
    Oiling StyleThrough pushrod
    Rocker Arm Nuts IncludedNo
    Cylinder Head FinishNatural
    Valve Seats MachinedYes
    Intake Valve Angle15
    Maximum Valve Lift0.57 in (14.478 mm)
    Valve Seat MaterialSteel
    Heat CrossoverNo
    Number Of Springs Per ValveSingle
    Valve Springs IncludedYes
    Spark Plug StyleAngled
    Exhaust Port ShapeD-Port
    Damper Spring IncludedNo
    Valve Guides IncludedYes
    Cnc-Machined Intake RunnerNo
    Intake Valves IncludedYes
    Cylinder Head TypeRectangular Port
    Valve Stem Seals IncludedYes
    Intake Valve Diameter2.165 in (54.991 mm)
    Accessory Bolt Holes DrilledYes
    Exhaust Port LocationStandard
    Valve Guide MaterialPowdered metal
    Outside Diameter Of Outer Spring1.29 in (32.8 mm)
    Combustion Chamber Volume (Cc)70
    Machined For O-RingNo
    Exhaust Valve Angle15
    Steam Holes DrilledNo
    Rocker Arm Studs IncludedNo
    Cylinder Head StyleAssembled
    Part FitmentSemi Universal
    Valve Cover Mounting StyleCenterbolt
    Valve Stem Seal StylePositive stop
    Retainer MaterialSteel
    Intake Runner Volume (Cc)260
    Cnc-Machined Exhaust RunnerNo
    Cnc-Machined Combustion ChamberNo
    Exhaust Valve Diameter1.59 in (40.386 mm)
    Package Qty1
    Package TypeEA
    No Questions
    No Reviews

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