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1803 Fully-Assembled 238 cc Enforcer As-Cast Cylinder Head for GM LS3
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AFR - AIRFLOW RESEARCHPART NUMBER: 033-1803

1803 Fully-Assembled 238 cc Enforcer As-Cast Cylinder Head for GM LS3

$76300
4 left in stock
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GM Gen III/IV LS
LS3 Cylinder Head
  • Rectangle Intake Ports: 238 cc As-Cast
  • Combustion Chamber: 72 cc
  • Valve Angle: 12 Degree
  • A356 Aluminum
  • Sold Individually

    AFR 238 cc Enforcer As-Cast LS3 Cylinder Head delivers big performance at a budget price, featuring as-cast ports and chambers, and race-ready components for GM LS3-style engines.

    AFR 238 cc Enforcer As-Cast LS3 Cylinder Head Includes:

    • 100% As Cast Intake, Exhaust, and Combustion Chambers
    • Competition 5-Angle Valve Job
    • 8 mm Bead Lock Intake Valves, 2.080 in. x 5.200 in. Overall Length: 7241
    • 8 mm Bead Lock Exhaust Valves, 1.600 in. x 5.205 in. Overall Length: 7212
    • PAC Racing 1.290 in. OD Hydraulic Roller Dual Valve Springs, 140 lbs Seat Pressure, .600 in. Max Lift, 6300–6500 Max RPM: 8017
    • 7° Steel Retainers, 1.245 in. OD x .880 in. ID x .655 in. Height: 8514
    • 7° Bead Lock Valve Keepers: 9007
    • Viton Valve Seals, .600 in. OD x .495 in. ID: 6615
    • Hardened Valve Spring OD Locators, 1.380 in. OD x .570 in. ID: 8042
    • Rocker Rail Stand: 6040

    AFR 238 cc Enforcer As-Cast LS3 Cylinder Head Features:

    • Fully-assembled with 2.165 in. intake and 1.600 in. exhaust valves
    • High-flow, as-cast 238 cc intake ports for excellent performance
    • Fast-burn 69 cc as-cast combustion chambers
    • Includes PAC 1218-style 1.290 in. dual valve springs for up to .600 in. lift
    • 7° retainers, machined steel spring cups, and Viton valve seals included
    • Accepts factory-style rocker arms and LS3 intake manifolds
    • Made from A356 aluminum with reinforced rocker pads
    • Designed for naturally aspirated street/strip builds

    AFR 238 cc Enforcer As-Cast LS3 Cylinder Head Notes:

    • Fits GM LS3-style engines with rectangular port heads
    • Does not include pushrods, rocker arms, or head gaskets
    • Recommended for use with hydraulic roller camshafts
    • Use with 3-bolt cam gear and factory LS3 intake patterns
    • Torque to AFR’s recommended specifications
    • GM Rocker Arms are not designed/engineered to accommodate aftermarket cams or higher spring pressures. At a minimum AFR recommends using a Bushing Trunion Kit

    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

    • AFR Enforcer Cylinder Heads

      AFR Enforcer Cylinder Heads are engineered to deliver improved airflow, increased horsepower potential, and dependable street performance for enthusiasts building high-performance small block and big block engine combinations. Designed by AFR Airflow Research, these cylinder heads provide an excellent balance of airflow efficiency, combustion performance, and affordability, making them a popular choice for street performance builds, restoration projects, muscle cars, and weekend racers. Whether you're upgrading a small block Chevy Camaro, building a Ford street machine, or refreshing a classic Mopar muscle car, AFR Enforcer Cylinder Heads offer the performance-focused engineering serious enthusiasts expect from AFR.

      Show More

      Cylinder heads play a critical role in determining engine airflow efficiency, combustion quality, and overall horsepower capability. AFR Enforcer Cylinder Heads are designed using advanced port and chamber technology to improve intake and exhaust flow characteristics compared to restrictive factory castings. Performance enthusiasts appreciate the ability to gain stronger throttle response, improved torque output, and enhanced top-end power while maintaining excellent street drivability and long-term reliability.

      Performance Benefits & Key Features

      AFR Enforcer Cylinder Heads are engineered to optimize airflow velocity and combustion efficiency for naturally aspirated street and mild racing applications. Their precision-designed intake runners and combustion chambers help improve cylinder filling and fuel atomization, contributing to increased horsepower and torque across a broad RPM range.

      Constructed from lightweight aluminum, these cylinder heads help reduce overall engine weight while improving heat dissipation and thermal stability compared to traditional cast iron designs. Enthusiasts benefit from improved cooling efficiency, reduced detonation risk, and enhanced engine responsiveness during aggressive driving conditions.

      These cylinder heads are commonly paired with aftermarket camshafts, intake manifolds, carburetors, EFI systems, and performance exhaust setups to maximize engine output and overall drivability. AFR Enforcer Cylinder Heads are especially popular for street performance builds, Pro Touring projects, drag racing applications, hot rods, and restoration vehicles where dependable power gains and consistent engine performance are priorities.

      Performance enthusiasts also value AFR’s reputation for CNC-inspired airflow development and precision manufacturing quality. The Enforcer series provides an accessible performance upgrade while still delivering the airflow improvements and engineering precision associated with AFR cylinder head technology.

      Fitment, Compatibility & Applications

      AFR Enforcer Cylinder Heads are compatible with a wide variety of GM, Ford, and Mopar V8 engine applications used in muscle cars, classic trucks, street rods, and custom performance vehicles. Popular applications include Camaros, Mustangs, Chevelles, Chargers, Novas, hot rods, and street/strip builds requiring improved airflow and modern cylinder head technology.

      Ideal for street performance enthusiasts, restoration builders, and weekend racers seeking dependable horsepower gains and improved engine efficiency, these cylinder heads deliver the quality and airflow performance expected from AFR Airflow Research. Explore the available AFR Enforcer Cylinder Head options to upgrade your engine with proven airflow technology and enhanced street performance.

    Part TypeCylinder Head
    Product LineAFR Enforcer Cylinder Heads
    BrandAFR - AIRFLOW RESEARCH
    Package Height7.9
    Package Width10.8
    Package Length21.7
    Weight33.575 PG
    Part CategoryPerformance Parts
    Valve Springs IncludedYes
    Cylinder Head MaterialAluminum
    Valve Guides IncludedYes
    Intake Port LocationStandard
    Cnc-Machined Intake RunnerNo
    Intake Valves IncludedYes
    QuantitySold individually
    Valve Stem Seals IncludedYes
    Exhaust Valves IncludedYes
    Accessory Bolt Holes DrilledYes
    Locks IncludedYes
    Exhaust Port LocationStandard
    Retainers IncludedYes
    Rocker Arms IncludedNo
    Combustion Chamber Volume (Cc)72
    Cylinder Head StyleAssembled
    Cylinder Head FinishNatural
    Valve Seats MachinedYes
    Part FitmentSemi Universal
    Intake Runner Volume (Cc)238
    Cnc-Machined Exhaust RunnerNo
    Cnc-Machined Combustion ChamberNo
    Vendor Part Number1803
    Package Qty1
    Package TypeEA

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