AFR 23° SBC Cylinder Head 245cc Competition Package Head, Spread Port Exhaust, 70cc Chambers

AFR 23° SBC Cylinder Head 245cc Competition Package Head, Spread Port Exhaust, 70cc Chambers

The AFR 245cc SBC Race Cylinder Head is the most advanced and powerful 60/40 head designed for small block Chevy applications. Featuring 100% CNC-machined intake runners, exhaust ports, and combustion chambers, these heads are capable of flowing an impressive 350 CFM at 0.800” lift. Built with titanium retainers and high-quality components, this competition-ready cylinder head ensures maximum performance for high-RPM race engines. The 60/40 valve spacing requires shaft-mounted rocker arms for optimal valvetrain geometry and includes extra machining for 3/8” pushrod clearance. The NPP (No Pushrod Pinch) design enhances airflow efficiency for uncompromised power delivery.

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 5.000") - AFR #7253
• 8mm Bead Lock Exhaust Valve (1.600" x 5.030") - AFR #7254
• PAC #1225 Racing Springs (1.550” OD Solid Roller Dual Valve Drag Race Spring, 250 lbs. on seat, .800” max 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
• 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

Tested at 28" of water pressure on a Superflow 600 with a 4.155" bore size, intake 3/4" radius plate, and 1 7/8" curved exhaust pipe.

Specifications & Features

• Material: A356 Aluminum
• Intake Port Volume: 245cc
• Exhaust Port Volume: 80cc
• Combustion Chamber Size: 70cc or 80cc
• Valve Angle: 23°
• Deck Thickness: .750"
• Minimum Bore Diameter: 4.000"
• Flat Mill: .006" per cc (65cc Maximum)
• Angle Mill: .009" per cc (60cc Maximum)
• Minimum Cross Sectional Area: 2.730 sq. in.
• Spark Plug Dimensions: 14mm x .750" w/Gasket Seat

Important Notes

WARNING: These cylinder heads are designed for competition use only and are illegal for operation on any public highway, road, or park. Violations may result in fines of up to $37,500 per infraction, revocation of DMV registration, and loss of public roadway use rights. These heads are only legal for use on dedicated race vehicles.