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AFR Chevy 238cc Enforcer As-Cast LS3 Cylinder Head, 72cc Chambers, Assembled

AFR 1803
AFR's 238 LS3 Enforcer Cylinder head feature our 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.

Head come fully assembled with the identical components found in our higher end CNC ported cylinder head; such as PAC Racing springs, viton valve seals, machined bead valve locks (not stamped), hardened spring seats, ductile iron seats (not powdered metal) and our 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 pieces required per engine.
Limited Supply: only 4 remaining
Shipping: FREE continental USA ground shipping on ALL AFR Cylinder Heads
Was: $1,050.91
Sale: $750.91
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Description

AFR's 238cc LS3 Enforcer Cylinder head feature a 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. This budget friendly head is perfect for your OEM engine operating below 6300 RPM.

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

Test conducted at 28" of water (pressure) on Superflow 1020
Bore Size: 4.060", intake 3/4" radius plate exhaust, 1 3/4" curved pipe

Basic Package Components Part #
As-Cast Combustion Chambers
As-Cast Exhaust Ports
As-Cast Intake Ports
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 maximum lift, Max RPM 7000-7200 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

Head 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
Spark Plug Dimensions
14mm x .750" w/ Tapered or Gasket Seat
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)

Details

  • AFR 1803
  • AFR 1803
  • Air Flow Research
  • Available
  • New

Shipping Information

  • Item Requires Shipping
  • 35.0 lbs.
  • W12.0000” x H12.0000” x L24.0000”
  • Free Basic Shipping
  • This item ships in its own box.
  • FREE continental USA ground shipping on ALL AFR Cylinder Heads

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