AFR 23° SBC Cylinder Head 235cc Competition Package Heads, Spread Port Exhaust, 80cc Chambers

AFR 23° SBC Cylinder Head 235cc Competition Package Heads, Spread Port Exhaust, 80cc Chambers

The AFR 235cc SBC Race Cylinder Head is engineered for serious racing applications, delivering maximum performance with 100% CNC-machined intake runners, exhaust ports, and combustion chambers. Designed with a 60/40 valve spacing for optimal valve train geometry, these heads require shaft-mounted rocker arms but can accommodate .050 offset intake rockers for drag racing applications. Built with high-quality components, including titanium retainers and PAC Racing springs, these heads offer superior airflow and durability.

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, 2.125″ x 5.00″ long O.A.L. (AFR #7253)
• 8mm Bead Lock Exhaust Valve, 1.600″ x 5.030″ long O.A.L. (AFR #7254)
• PAC Racing Springs 1.550″ OD Solid Roller Dual Drag Race Spring, 250 lbs on seat, .800″ maximum lift, Max RPM 8000-8200 (AFR #8001)
• 10° Titanium Retainers 1.500” O.D x 1.120” I.D x .705” I.D (AFR #8505)
• 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)

Performance Flow Chart

Flow test conducted at 28″ of water (pressure) on Superflow 600, Bore Size: 4.155″, intake 3/4″ radius plate exhaust, 1 7/8″ curved pipe.

Specifications & Features

• Material: A356 Aluminum
• Intake Port Volume: 235cc
• Exhaust Port Volume: 80cc
• Combustion Chamber Size: 70cc or 80cc
• Valve Angle: 23°
• Deck Thickness: .750″
• Minimum Bore Diameter: 4.000″

Legal Disclaimer

These products are illegal for operation on public highways. They are only legal for dedicated racing vehicles. Violations may result in penalties up to $37,500 per violation per vehicle.