AFR 23° SBC Cylinder Head 227cc Race Ready Heads, Spread Port Exhaust, 75cc Chambers

AFR 23° SBC Cylinder Head 227cc Race Ready Heads, Spread Port Exhaust, 75cc Chambers

The AFR 227cc SBC Race Cylinder Head is designed for high-performance applications, featuring 100% CNC-ported intake, exhaust, and combustion chambers. Built from premium A356 aluminum castings, these heads incorporate top-tier components for maximum durability and performance. With 60/40 valve spacing, they require shaft mount rocker arms for optimal valvetrain geometry but can be used with .050 offset intake rockers for drag race-only applications.

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, 2.100″ x 5.000″ – AFR #7256
• 8mm Bead Lock Exhaust Valve, 1.600″ x 5.030″ – AFR #7254
• PAC Racing Spring 1.550″ OD Solid Roller Dual Valve Spring – AFR #8000
• 10° Steel Retainers 1.500″ O.D x 1.120″ I.D x .705″ I.D – AFR #8511
• 10° Bead Lock Valve Keepers with lashcap recess – AFR #9009
• ARP 7/16″ Rocker Studs – AFR #6405
• Adjustable 5/16″ Guide Plates – AFR #6103
• Viton Valve Seals .600″ O.D x .495″ I.D – AFR #6612
• Hardened Valve Spring I.D Locator 1.550” O.D x .780” I.D – AFR #8048
• Ductile Iron Intake Valve Seats 2.200″ O.D x 1.750″ I.D x.375″ Deep – AFR #9060
• Ductile Iron Exhaust Valve Seats 1.696″ O.D x 1.325″ I.D x .305″ Deep – AFR #9070
• 8mm Bronze Valve Guides .502″ O.D x 2.100″ O.A.L – AFR #9051

Flow Bench Results

Tested at 28″ of water pressure on a Superflow 1020.

227cc Race Ready™ Flow Chart

Technical Specifications

• Material: A356 Aluminum
• Intake Port Volume: 227cc
• Exhaust Port Volume: 80cc
• Combustion Chamber Size: 65cc or 75cc
• Valve Angle: 23°
• Deck Thickness: .750″
• Minimum Bore Diameter: 4.000″
• Spark Plug Dimensions: 14mm x .750″ w/Gasket Seat

Legal Disclaimer

CARB Status: THESE PRODUCTS ARE ILLEGAL TO OPERATE ON ANY PUBLIC HIGHWAY. THEY ARE ONLY LEGAL IF USED ON A DEDICATED RACING VEHICLE. VIOLATIONS MAY RESULT IN FINES UP TO $37,500 PER VEHICLE, REGISTRATION REVOCATION, AND OTHER PENALTIES.