AFR 23° SBC Cylinder Head 220cc Race Ready Heads, Standard Exhaust, 65cc Chambers

The AFR 220cc SBC Race Cylinder Head is designed for serious performance enthusiasts. These "Race Ready" and "Competition" heads feature 100% CNC-ported intake, exhaust, and combustion chambers for maximum airflow and efficiency. Constructed with high-quality A356 aluminum castings, these heads provide excellent durability and power potential. As AFR's largest and highest flowing SBC head with conventional rocker arms, they are ideal for racing applications or aggressive "Pro Street" builds.

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" (AFR #7256)
8mm Bead Lock Exhaust Valve, 1.600" x 5.030" (AFR #7254)
PAC Racing Spring 1.550" OD Solid Roller Dual Valve Spring, 220 lbs on seat, .710" max lift, 7200-7400 max RPM (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)
8 mm Bronze Valve Guides .502" O.D x 2.100" O.A.L (AFR #9051)

Performance Flow Chart

220cc Race Ready™ Head Flow Chart (Measured at 28" of water pressure)

Lift	.200	.300	.400	.500	.550	.600	.650
Intake	155	210	260	295	304	312	318
Exhaust	116	162	204	220	225	229	233

Specifications & Features

Material: A356 Aluminum
Intake Port Volume: 220cc
Intake Port Dimensions: 2.220" H x 1.310" W x 3/8 Radius
Exhaust Port Volume: 80cc
Exhaust Port Dimensions: 1.420" H x 1.545" W
Combustion Chamber Size: 65cc or 75cc
Valve Cover Bolt Pattern: Perimeter Bolt
Valve Angle: 23°
Deck Thickness: .750"
Minimum Bore Diameter: 4.000"
Flat Mill: .006" per cc (60cc Maximum)
Spark Plug Dimensions: 14mm x .750" w/Gasket Seat

Legal Disclaimer

CARB Status: These products are illegal to operate on any public highway, whether paved or unpaved. They are only legal for dedicated racing vehicles. Violations may result in penalties up to $37,500 per violation per vehicle, registration revocation, and loss of use on public roadways.