AFR 23° SBC Cylinder Head 227cc Competition Package Heads, Standard Exhaust, 65cc Chambers

AFR 23° SBC Cylinder Head 227cc Competition Package Heads, Standard Exhaust, 65cc Chambers

The AFR 23° SBC Cylinder Head 227cc Competition Package Heads are engineered to deliver exceptional performance for your racing engine. These heads are designed for high-end applications, featuring AFR's 227cc "Race Ready" and "Competition" heads with 100% CNC ported intake, exhaust, and combustion chambers. Manufactured from A356 aluminum, these heads incorporate high-quality components to withstand the rigors of competitive racing. With a 60/40 valve spacing, these heads require shaft mount rocker arms for optimum valve train geometry and can also be used with .050 offset intake rockers for drag race applications.

Piston Specifications

• Valve Spacing: 60/40
• Required Rocker Arms: Shaft mount rocker arms for optimal geometry (can use .050 offset intake rockers for drag race only applications)
• Material: A356 Aluminum
• Intake Port Volume: 227cc
• Exhaust Port Volume: 80cc
• Combustion Chamber Size: 65cc
• Intake Port Dimension: 2.200" H x 1.290" W, 5/16" Radius
• Exhaust Port Dimension: 1.430" H x 1.540" W
• Valve Angle: 23°
• Valve Cover Bolt Pattern: Perimeter Bolt
• Minimum Bore Diameter: 4.000"

Included Components

• CNC Ported Combustion Chambers: 100% CNC ported
• CNC Ported Exhaust Ports: 100% CNC ported
• CNC Ported Intake Ports: 100% CNC ported
• Competition 5-Angle Valve Job: Precision valve job for maximum airflow
• Intake Valve: 8mm Bead Lock, 2.100" x 5.000" Overall Valve Length (AFR #7256)
• Exhaust Valve: 8mm Bead Lock, 1.600" x 5.030" Overall Valve Length (AFR #7254)
• Valve Springs: PAC Racing Spring, 1.550" OD Solid Roller Dual Valve Spring, 220 lbs on seat, .710" max lift (AFR #8000)
• Valve Retainers: 10° Steel, 1.500" O.D x 1.120" I.D x .705" I.D (AFR #8511)
• Valve Keepers: 10° Bead Lock Valve Keepers with lashcap recess (AFR #9009)
• Rockers Studs: ARP 7/16" (AFR #6405)
• Guide Plates: Adjustable 5/16" (AFR #6103)
• Valve Seals: Viton Valve Seals, .600" O.D x .495" I.D (AFR #6612)

Performance & Compatibility

The AFR 227cc "Race Ready" and "Competition" heads are engineered to support serious racing demands. With superior flow characteristics, these heads offer substantial improvements in airflow over stock heads, delivering an increase in horsepower and torque for maximum performance on the track. Flow charts show impressive results at various lift points, ensuring that these heads meet the needs of high-performance racing engines.

227cc Race Ready™ Flow Chart

Warning:

THESE PRODUCTS ARE ILLEGAL TO OPERATE ON ANY PUBLIC HIGHWAY. THIS MEANS ANY PUBLIC PAVED OR UNPAVED ROADWAY OR IN A PUBLIC PARK. THESE PRODUCTS ARE ONLY LEGAL IF USED ON A DEDICATED RACING VEHICLE. VIOLATIONS ARE SUBJECT TO A MAXIMUM PENALTY OF $37,500 PER VIOLATION PER VEHICLE, REVOCATION OF REGISTRATION BY DMV, LOSS OF USE ON PUBLIC RIGHT OF WAYS, AND PROOF OF CORRECTION OF THE TAMPERING.