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

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

The AFR 23° SBC 235cc Competition Package Heads are designed for high-performance drag racing applications. Built with precision CNC-machined intake runners, exhaust ports, and combustion chambers, these heads are the perfect choice for optimizing engine efficiency and power. Equipped with titanium retainers, PAC Racing Springs, and high-quality components, they feature a 60/40 valve spacing for superior valve train geometry. These heads are compatible with shaft-mounted rocker arms and can be used with .050 offset intake rockers for specialized drag race setups.

Included Components

• 100% CNC Ported Combustion Chambers
• 100% CNC Ported Exhaust Ports
• 100% CNC Ported Intake Ports
• Competition 5-angle Valve Job

Valve and Spring Components

• Intake Valve: 8mm Bead Lock, 2.125" x 5.00" O.A.L. - AFR #7253
• Exhaust Valve: 8mm Bead Lock, 1.600" x 5.030" O.A.L. - AFR #7254
• Valve Springs: 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
• Titanium Retainers: 10° 1.500” O.D x 1.120” I.D x .705” I.D - AFR #8505
• Bead Lock Valve Keepers: 10° with lash cap recess - AFR #9009
• Rocker Studs: ARP 7/16" - AFR #6405
• Adjustable Guide Plates: 5/16" - AFR #6103
• Viton Valve Seals: .600" O.D x .495" I.D - AFR #6612
• Valve Spring I.D Locator: Hardened, 1.550” O.D x .780” I.D - AFR #8048
• Valve Seats: Ductile Iron, Intake 2.200" O.D x 1.750" I.D x.375" Deep, Exhaust 1.696" O.D x 1.325" I.D x .305" Deep - AFR #9060 / AFR #9070
• Bronze Valve Guides: 8mm, .502" O.D x 2.100" O.A.L - AFR #9051

Performance Flow Chart

The 235cc Competition heads deliver impressive flow numbers, tested at 28" of water on Superflow 600:

Specifications & Features

• Material: A356 Aluminum
• Intake Port Volume: 235cc
• Intake Port Dimensions: 2.200" H x 1.290" W, 5/16 Radius
• Exhaust Port Volume: 80cc
• Combustion Chamber Size: 70cc or 80cc
• Valve Cover Bolt Pattern: Perimeter Bolt
• Valve Angle: 23°
• Deck Thickness: .750"
• Minimum Bore Diameter: 4.000"
• Spark Plug Dimensions: 14mm x .750" w/Gasket Seat

Legal Notice

WARNING: These products are illegal to operate on any public highway, including public paved or unpaved roadways or in a public park. They are only legal for use on dedicated racing vehicles. Violations may result in penalties up to $37,500 per violation per vehicle, revocation of vehicle registration by DMV, and loss of use on public right-of-ways.