AFR 12° LS3 Enforcer As Cast 238cc Int Runner, 72cc Chamber
AFR's 238 LS3 Enforcer Cylinder Heads feature our Permanent Mold “As-Cast” Technology, ensuring extremely accurate and repeatable port locations and performance. The AFR 238cc LS3 Enforcer is the first Enforcer casting with a 100% AFR design. With a smaller valve and port, this head outflows your OE LS3 casting, delivering superior performance potential.
Designed for OEM engines operating below 6300 RPM, this budget-friendly cylinder head comes fully assembled with premium components found in AFR’s high-end CNC-ported heads. These include PAC Racing springs, Viton valve seals, machined bead valve locks, hardened spring seats, and one-piece 8mm 21-4N/21-8N Stainless Steel valves. Also available as a bare casting for DIY enthusiasts.
Sold individually—two required per engine.
Basic Package Components
- 100% As Cast Intake, Exhaust, and Combustion Chambers
- Competition 5-angle Valve Job
- 8mm Bead Lock Intake Valve, 2.080" x 5.200" Overall Valve Length (AFR #7241)
- 8mm Bead Lock Exhaust Valve, 1.600" x 5.205" Overall Valve Length (AFR #7212)
- PAC Racing Spring 1.270" OD Hydraulic Roller Dual Valve Spring, 155 lbs. on seat, .650" max lift, Max RPM 7000-7200 (AFR #8017)
- 7° Steel Retainers (AFR #8514)
- 7° Bead Lock Valve Keepers (AFR #9007)
- Viton Valve Seals (AFR #6615)
- Hardened Valve Spring O.D Locator (AFR #8042)
- Rocker Rail Stand (AFR #6040)
Flow Chart Data
Flow Numbers (CFM) at 28” of water (Superflow 1020) - Bore Size: 4.060”
| Lift (in) |
.200 |
.300 |
.400 |
.500 |
.550 |
.600 |
.650 |
| Intake (CFM) |
157 |
229 |
276 |
307 |
315 |
308 |
308 |
| Exhaust (CFM) |
112 |
152 |
182 |
204 |
209 |
215 |
217 |
Recommended Components
- Intake Port Gasket: Factory GM or Aftermarket
- Recommended Rockers: OEM w/ trunion upgrade or Yella Terra 6733 w/ 5132 Valve Cover Gasket
- Exhaust Port Gasket: GM #12558573
- Head Gasket: Cometic 4.160 Bore Size
- Head Bolts: ARP 134-3610 (AFR #6334)
- Head Studs: ARP #234-4317 (2004 & Later Blocks), ARP #234-4316 (Pre-2004 Blocks) (AFR #6335)
- Suggested Manifold: FAST 92mm or 102mm
- Spark Plug Starting Range: NGK TR55
Specifications & Features
- Material: A356 Aluminum
- Intake Port Volume: 238cc
- Exhaust Port Volume: 92cc
- Combustion Chamber Size: 72cc
- Valve Angle: 12°
- Deck Thickness: .750"
- Minimum Bore Diameter: 4.000"
