AFR 23° SBC Cylinder Head 227cc Race Ready Heads, Standard Exhaust, 65cc Chambers

AFR 23° SBC Cylinder Head 227cc Race Ready Heads, Standard Exhaust, 65cc Chambers

The AFR 227cc SBC Race Cylinder Head is engineered for high-performance racing applications, featuring A356 aluminum castings, 100% CNC-ported intake, exhaust, and combustion chambers, and premium components. Designed with 60/40 valve spacing, these heads require shaft mount rocker arms for optimal valvetrain geometry but can accommodate .050 offset intake rockers for drag racing 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″ 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, 220 lbs on seat, .710″ max lift (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)

227cc Race Ready™ Flow Chart

Specifications & Features

• Material: A356 Aluminum
• Intake Port Volume: 227cc
• Intake Port Dimensions: 2.200″ H x 1.290″ W, 5/16″ Radius
• Intake Port Location: Stock
• Exhaust Port Volume: 80cc
• Exhaust Port Dimensions: 1.430″ H x 1.540″ W
• Exhaust Port Location: .250″ Raised
• 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

Important Legal Notice

THESE PRODUCTS ARE ILLEGAL TO OPERATE ON ANY PUBLIC HIGHWAY. USE IS RESTRICTED TO DEDICATED RACING VEHICLES ONLY. VIOLATION MAY RESULT IN A MAXIMUM PENALTY OF $37,500 PER VIOLATION PER VEHICLE, REVOCATION OF DMV REGISTRATION, AND LOSS OF USE ON PUBLIC ROADS.