AFR 210cc LS1 Enforcer Cylinder Head - Small Bore 5.3L - Single Head

AFR 210cc LS1 Enforcer Cylinder Head - Small Bore 5.3L

AFR’s 210cc LS1 Enforcer Cylinder Heads bring an affordable performance upgrade to your OEM 5.3L setup, built to perform smoothly up to 6300 RPM. Using advanced As-Cast technology, these heads offer precision and consistency in port location and flow. Equipped with PAC Racing springs, Viton valve seals, hardened spring seats, and one-piece 8mm 21 4N Stainless Steel valves, they come fully assembled with premium components typically found in higher-end models. These heads are ideal for drivers looking for dependable performance on a budget.

Included Components

• 8mm Bead Lock Intake Valve: 2.000" x 4.900" O.A.L., AFR #7236
• 8mm Bead Lock Exhaust Valve: 1.570" x 4.915" O.A.L., AFR #7235
• PAC Racing Spring: 1.290" OD, 140 lbs on seat, .600" max lift, AFR #8017
• 7° Chrome Moly Retainers: 1.245" O.D x .885" I.D, AFR #8514
• 7° Bead Lock Valve Keepers: AFR #9007
• Viton Valve Seals: .620" O.D x .490" I.D, AFR #6615
• Hardened Valve Spring O.D Locator: 1.380" O.D x .570" I.D, AFR #8042

Flow Chart

Tested at 28" of water (pressure) on Superflow 1020. Bore Size: 4.060"

Specifications & Features

• Material: A356 Aluminum
• Intake Port Volume: 210cc
• Exhaust Port Volume: 82cc
• Combustion Chamber Size: 64cc
• Deck Thickness: 0.425"
• Minimum Bore Diameter: 3.780"
• Valve Angle: 15°
• Spark Plug Dimensions: 14mm x .750" w/Tapered Seat
• CARB Status: For dedicated race use only, not street-legal.

Recommended Components

• Head Gasket: Factory GM LS2
• Intake Port Gasket: GM or FAST
• Exhaust Port Gasket: GM #12558573
• Head Bolts (97-03): AFR #6330
• Head Studs (97-03): AFR #6331
• Head Bolts (04+): AFR #6334
• Head Studs (04+): AFR #6335
• Suggested Manifold: FAST 90mm, 92mm, or 102mm
• Spark Plug Starting Range: NGK TR55
• Sold Individually