AFR 15° LS Cathedral Port Cylinder Head 230cc Fully CNC Ported, 62cc Chambers, Big Bore

The AFR 230cc LS1 MONGOOSE cylinder heads are designed for aggressive street and street/strip builds, supporting engine displacements up to 427 cubic inches. With fully CNC-ported intake, exhaust, and combustion chambers, these heads offer superior airflow, achieving 328 CFM at 0.650" lift on a 4.000" bore size. Ideal for high-performance applications operating at or below 7200 RPM.

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, .650” maximum lift, 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. AFR locks match GM LSX specifications.

230cc Small Bore Competition Flow Chart

Lift (in.)	.200	.300	.400	.500	.550	.600
Intake (CFM)	157	224	272	311	320	324
Exhaust (CFM)	129	183	225	244	248	252

Specifications & Features

Material: A356 Aluminum
Intake Port Volume: 230cc
Exhaust Port Volume: 86cc
Combustion Chamber Size: 62cc, 65cc, or 72cc
Valve Angle: 15°
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)
Spark Plug Dimensions: 14mm x .750" w/Tapered Seat

Performance & Compatibility

Designed for high-performance LS applications, the AFR 230cc LS1 heads deliver exceptional airflow, making them ideal for naturally aspirated and forced induction builds. With robust CNC porting and optimized valve angles, these heads ensure maximum efficiency and power across the RPM range.

*CARB Status: This product is not legal for sale or use on emission-controlled vehicles and is intended for dedicated race vehicles only.*