AFR 23° SBC Cylinder Head 210cc Competition Package Heads, Spread Port Exhaust, 65cc Chambers

AFR’s 210cc “Race Ready” and “Competition” cylinder heads are precision-engineered for maximum airflow and performance. Featuring 100% CNC-ported intake, exhaust, and combustion chambers, these heads are constructed from high-quality A356 aluminum castings, making them ideal for race applications and aggressive street/strip builds up to 400 cubic inches. Designed to operate up to 6500-6800 RPM, they deliver outstanding performance for competitive engines.

Key Features

Chamber Size: 65cc
Porting Finish: Competition
Spread Port Exhaust: Yes
Material: A356 Aluminum
Intake Port Volume: 210cc
Exhaust Port Volume: 80cc
Valve Angle: 23°
Deck Thickness: .750"
Minimum Bore Diameter: 4.000"

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, 2.080" x 5.000" Overall Valve Length (AFR #7255)
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, Max RPM 7200-7400 (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 (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)