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

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.

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 1.290" 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

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)