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

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

AFR's 227cc "Race Ready" and "Competition" heads are designed for serious performance enthusiasts. These heads feature 100% CNC ported intake, exhaust, and combustion chambers, ensuring maximum airflow and power potential. Constructed from A356 aluminum, these heads are built with high-quality components throughout to deliver exceptional performance in demanding racing conditions. The heads are optimized for shaft mount rocker arms, providing superior valve train geometry for enhanced engine reliability and precision.

Piston Specifications

• Piston Top: 100% CNC Ported Combustion Chambers
• Approximate Compression Ratios:
  • 65cc or 75cc Combustion Chambers
  *For exact compression, use a compression calculator for precise adjustments.*
• Engine Compatibility: 23° SBC Engine
• Engine Sizes Supported: Compatible with engines requiring 227cc intake volume and 80cc exhaust volume

Technical Details

• Material: A356 Aluminum
• Intake Port Volume: 227cc
• Intake Port Dimension: 2.200" H x 1.290" W with 5/16" Radius
• Exhaust Port Volume: 80cc
• Exhaust Port Dimension: 1.430" H x 1.540" W
• Exhaust Port Location: .250" Raised
• Valve Cover Bolt Pattern: Perimeter Bolt
• Valve Angle: 23°
• Deck Thickness: .750"
• Spark Plug Dimensions: 14mm x .750" w/Gasket Seat

Performance & Compatibility

With AFR's 227cc Competition Cylinder Heads, your engine will experience improved flow dynamics, optimized for high-performance applications. These heads are designed for maximum power and efficiency, delivering exceptional intake and exhaust port flow rates that are proven through rigorous testing. Ideal for applications in drag racing and competitive motorsport environments, these heads offer durability and precision for enthusiasts who demand the best.

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" Overall Valve Length (AFR #7256)
• 8mm Bead Lock Exhaust Valve, 1.600" x 5.030" Overall Valve Length (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 (AFR #8048)
• Ductile Iron Intake Valve Seats (AFR #9060)
• Ductile Iron Exhaust Valve Seats (AFR #9070)
• 8mm Bronze Valve Guides (AFR #9051)