Afr Chevy 238cc Enforcer As-Cast Ls3 Bare Cylinder Head, 72cc Chambers, Bare

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 comes completely bare, no parts. 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  
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)