AFR 23° SBC Cylinder Head 210cc Race Ready Heads, Standard Exhaust, 75cc Chambers

AFR’s 210cc "Race Ready" and "Competition" cylinder heads feature 100% CNC ported intake, exhaust, and combustion chambers, offering outstanding performance for aggressive street/strip and dedicated race applications. Made from A356 aluminum castings, these high-quality cylinder heads are designed for engines up to 400 cubic inches, operating efficiently up to 6500-6800 RPM.

Specifications & Features

Material: A356 Aluminum
Combustion Chamber Size: 75cc
Intake Port Volume: 210cc
Intake Port Dimensions: 2.200" H x 1.310" W x 3/8" Radius
Intake Port Location: Stock
Exhaust Port Volume: 80cc
Exhaust Port Dimensions: 1.420" H x 1.545" W
Exhaust Port Location: .250" Raised
Valve Angle: 23°
Deck Thickness: .750"
Minimum Bore Diameter: 4.000"
Spark Plug Dimensions: 14mm x .750" w/Gasket Seat
CARB Status: Not legal for sale or use on emission-controlled vehicles; intended for dedicated race vehicles only.

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") – AFR #7255
8mm Bead Lock Exhaust Valve (1.600" x 5.030") – AFR #7254
PAC Racing Spring 1.550" OD Solid Roller Dual Valve Spring (Max RPM 7200-7400) – AFR #8000
10° Steel Retainers – 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 – AFR #6612
Hardened Valve Spring I.D. Locator – AFR #8048
Ductile Iron Intake Valve Seats – AFR #9060
Ductile Iron Exhaust Valve Seats – AFR #9070
8mm Bronze Valve Guides – AFR #9051

Performance Flow Chart (Race Ready)

Lift (in.)	Intake Flow (CFM)	Exhaust Flow (CFM)
.200	145	110
.300	199	158
.400	248	192
.500	285	210
.550	301	214
.600	309	220
.650	311	222

Performance & Compatibility

AFR’s 210cc Race Ready heads are a top choice for small block Chevy engines in race applications and high-performance street builds. Designed to handle aggressive camshafts and high RPM usage, these heads provide excellent airflow and durability. The 75cc combustion chamber ensures optimized compression for high-output engines, while the CNC porting enhances performance gains.