Air Flow Research
AFR LS3 Enforcer 238cc Cylinder Heads As Cast
- Part Number:
- 1804
- Availability:
- Ships from Manufacturer
- Shipping:
- Free Over $98 In U.S. 48
- Type:
- LS3 Cylinder Heads
- Material:
- A356 Aluminum
- CNC Machined Intake Runner:
- No
- CNC Machined Exhaust Runner:
- No
- CNC Machined Combustion Chamber:
- No
- Minimum Bore Size (in.):
- 4.000
- Valve Angle (°):
- 12
- Intake Runner Volume (cc):
- 238
- Exhaust Runner Volume (cc):
- 92
- Chamber Volume (cc):
- 72
- Intake Valve (in.):
- 2.080
- Exhaust Valve (in.):
- 1.600
- Rocker Arm Rails Included:
- Yes
- Valve Job:
- 5-Angle
- Quantity:
- Sold as a pair
Description
AFR LS3 Enforcer 238cc Cylinder Heads As Cast
AFR's 238 LS3 Enforcer Cylinder heads feature Permanent Mold “As-Cast” Technology surfaces on the intake runners, exhaust runners and combustion chambers that allows for extremely accurate and repeatable port location/performance. The AFR 238cc LS3 Enforcer is the first Enforcer casting with 100% AFR design. With a smaller valve and port, this head outflows your OE LS3 casting by up to 20CFM at low lifts, offering greater performance potential. This budget friendly head is perfect for your OEM engine operating below 6300 RPM. They come fully assembled with the identical components found in AFR higher end CNC ported cylinder heads; such as PAC Racing springs, viton valve seals, machined bead valve locks (not stamped), hardened spring seats, and AFR one piece 8mm 21-4N/21-8N Stainless Steel valves. They are available without any parts for the DIY. Sold as a single piece, 2 are required per engine. Please see footnotes for additional information.
| 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 1.290" OD Hydraulic Roller Dual Valve Spring, 140 lbs. on seat, .600 maximum lift, Max RPM 6300-6500 |
AFR #8017
|
| 7° Steel Retainers 1.245" O.D x .880" I.D x .655" I.D |
AFR #8514
|
| 7° Bead Lock Valve Keepers |
AFR #9007
|
| Viton Valve Seals .600" O.D x .495" I.D |
AFR #6615
|
| Hardened Valve Spring O.D Locator 1.380" O.D x .570" I.D |
AFR #8042
|
| Rocker Rail Stand |
AFR #6040
|
| 238cc LS3 As Cast Flow Chart | |||||||
| .200 | .300 | .400 | .500 | .550 | .600 | .650 | |
| Int | 157 | 229 | 276 | 307 | 315 | 308 | 308 |
| Exh | 112 | 152 | 182 | 204 | 209 | 215 | 217 |
| Recommended Components: | |
| Intake Port Gasket |
Factory GM or Aftermarket
|
| Recommend Rockers - OEM w/ trunion upgrade Yella Terra 6733 w/ 5132 Valve Cover gasket. |
Scorpion 1162
|
| Exhaust Port Gasket |
GM #12558573
|
| Head Gasket |
Cometic 4.160 Bore Size
|
| Head Bolts (04+), ARP 134-3610 |
AFR #6334
|
| Head Studs (04+), 2004 & Later Blocks ARP #234-4317, Pre 2004 Blocks ARP #234-4316 |
AFR #6335
|
| Head Bolt Washers, Manley |
AFR #6320
|
| Suggested Manifold |
FAST 92mm or 102mm
|
| Spark Plug Starting Range |
NGK TR55
|
| Pushrods: Longer than Stock (see instructions for details) | |
| Specifications & Features: | |
| Material |
A356 Aluminum
|
| Intake Port Volume |
238cc
|
| Intake Port Dimension |
2.540"H x 1.190"W x 7/16° Radius
|
| Intake Port Location |
Stock
|
| Exhaust Port Volume |
92cc
|
| Exhaust Port Dimension |
1.500" H x 1.740" W
|
| Exhaust Port Location |
Stock
|
| Combustion Chamber Size |
72cc
|
| Valve Cover Bolt Pattern |
Center Bolt
|
| Valve Angle |
12°
|
| Valve Spring Pocket Diameter |
1.490" O.D
|
| Max Valve Spring Pocket Machining |
1.510" O.D
|
| Warning: Do not machine spring pad any deeper. | |
| Deck Thickness |
.750"
|
| Minimum Bore Diameter |
4.000"
|
| Flat Mill - 65cc chamber |
.006" per cc 62cc Maximum
|
| Minimum Cross Sectional Area |
|
| Spark Plug Dimensions |
14mm x .750" w/ Tapered or Gasket Seat
|
| Carb EO# |
|
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Warranty Information
Effective on purchase made on or after January 1, 2010, AFR warranties AFR aluminum cylinder head castings for the lifetime of the product with proof of purchase to the original purchaser. Additionally, valves, guides, valve seats, valve springs, retainers, locks, studs, guide plates, and valve seals are warranted for two years to the original purchaser with proof of purchase. All returns must have a RMA number in order to be returned, call for a RMA number. Parts must be returned prepaid freight by the original purchaser. When it has been determined, by AFR at its sole discretion, that the product does indeed have a warrantable problem from workmanship, materials, or an undetermined cause (mystery failure) AFR will repair at no charge and reimburse UPS ground freight and return UPS ground freight. AFR will repair or replace the casting at its option. This warranty doesn’t cover fitness for purpose and/or merchantability on any product sold by AFR. Non-AFR castings are covered by the manufacturer of that casting.
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