AFR’s emission legal (CARB #D-250-4) 230cc LSX heads feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings, Titanium retainers and high quality components throughout. Recommended for aggressive street or street/strip builds with displacements up to 427 cubic inches, operating up to 7200 RPM. Requires minimum 3.900” bore size for intake valve clearance.
230cc Small Bore LSX Aluminum Cylinder Head Flow Chart
AFR 1660 test on 3.900 bore
230cc Large Bore LSX Aluminum Cylinder Head Flow Chart
AFR 1630 tested on 4.125 bore
Included Components
- 100% CNC Ported Combustion Chambers
- 100% CNC Ported Exhaust Ports
- 100% CNC Ported Intake Ports
- Competition 5-angle Valve Job
- 8mm Bead Lock Intake Valve, 2.080" x 4.900" Overall Valve Length: AFR #7208
- 8mm Bead Lock Exhaust Valve, 1.600" x 4.900" Overall Valve Length: AFR #7228
- PAC Racing Spring 1.270" OD Hydraulic Roller Dual Valve Spring, 155 lbs. on seat, Max RPM 7000-7200: AFR #8019
- 7° Titanium Retainers 1.245" O.D x .885" I.D x .655" I.D: AFR #8512
- 7° Bead Lock Valve Keepers: AFR #9007*
- Viton Valve Seals .600" O.D x .495" I.D: AFR #6612
- Hardened Valve Spring O.D Locator 1.380" O.D x .570" I.D: AFR #8042
- Ductile Iron Intake Valve Seats 2.131" O.D x 1.680" I.D x .375" Deep: AFR #9059
- Ductile Iron Exhaust Valve Seats 1.650" O.D x 1.350" I.D x .375" Deep: AFR #9069
- 8 mm Bronze Valve Guides .502" O.D x 2.100" O.A.L: AFR #9051
*LSX bead locks and aftermarket bead locks are not interchangeable. GM made their bead lock radius and depth different. AFR locks are the same as GM LSX.
Recommended Components:
- Intake Port Gasket: GM or FAST
- Exhaust Port Gasket: GM#12558573
- Head Gasket, Cometic 4.160 .040": AFR #6848
- Spark Plug Starting Range: NGK TR55
Specifications & Features:
- Material: A356 Aluminum
- Intake Port Volume: 230cc
- Intake Port Dimension: 3.250"H x 1.115"W x5/16 top 3/8 bottom
- Intake Port Location: Stock
- Exhaust Port Volume: 86cc
- Exhaust Port Dimension : 1.385" H x 1.695" W
- Exhaust Port Location: Stock
- Combustion Chamber Size: 62cc, 65cc, or 72cc
- Valve Cover Bolt Pattern: Center Bolt
- Valve Angle: 15°
- Valve Spring Pocket Diameter: 1.510" O.D
- Max Valve Spring Pocket Machining: 1.525" O.D
- Deck Thickness: .750"
- Minimum Bore Diameter: 3.900"
- Flat Mill - 62cc chamber: .006" per cc 58cc Maximum
- Flat Mill - 72cc chamber: .006" per cc 67cc Maximum
- Minimum Cross Sectional Area: 2.425 sq. in.
- Spark Plug Dimensions: 14mm x .750" w/Gasket Seat
- CARB E.O.: #D-250-4
