AFR 23° SBC Cylinder Head 195cc Street Heads, Straight Plug w/Heat Riser, 65cc

The AFR 195cc SBC Street Cylinder Head is designed for high-performance street applications, featuring 100% CNC ported intake, exhaust, and combustion chambers. Constructed from high-quality A356 aluminum castings, this cylinder head is ideal for small-block Chevy engines up to 400 cubic inches, operating up to 6500 RPM. These heads are CARB legal for 1994 and older emissions-controlled vehicles under EO #D-250-2.

Included Components

100% CNC Ported Combustion Chambers
90% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
Competition 5-angle Valve Job
8mm Bead Lock Intake Valve (2.050" x 4.900" Overall Length) - AFR #7252
8mm Bead Lock Exhaust Valve (1.600" x 4.950" Overall Length) - AFR #7250
PAC Racing Spring 1.290" OD Hydraulic Roller Dual Valve Spring (140 lbs on seat, .600" max lift, 6300-6500 Max RPM) - AFR #8017
7° Chrome Moly Retainers - AFR #8514
7° Bead Lock Valve Keepers - AFR #9007
ARP 3/8" Rocker Studs - AFR #6409
Adjustable 5/16" Guide Plates - AFR #6103
Viton Valve Seals - AFR #6612
Hardened Valve Spring O.D Locator - AFR #8042
Ductile Iron Intake Valve Seats - AFR #9060
Ductile Iron Exhaust Valve Seats - AFR #9070
8mm Bronze Valve Guides - AFR #9051

Performance Flow Chart

Test conducted at 28" of water pressure on Superflow 1020, Bore Size: 4.060"

Lift (inches)	.200	.300	.400	.500	.550
Intake (CFM)	146	201	247	275	280
Exhaust (CFM)	119	166	197	213	218

Specifications & Features

Material: A356 Aluminum
Intake Port Volume: 195cc
Intake Port Dimension: 2.110" H x 1.265" W 5/16 Radius
Exhaust Port Volume: 64cc
Exhaust Port Dimension: 1.450" H x 1.550" W
Combustion Chamber Size: 65cc
Valve Cover Bolt Pattern: Perimeter Bolt
Valve Angle: 23°
Deck Thickness: .750"
Minimum Bore Diameter: 4.000"
Flat Mill: .006" per cc, 60cc Maximum
Angle Mill: .009" per cc, 55cc Maximum (may require .120" thick intake gasket)
Minimum Cross Sectional Area: 1.905 sq. in.
Spark Plug Dimensions: 14mm x .750" w/Gasket Seat

Performance & Compatibility

The AFR 195cc Street Cylinder Heads are engineered for strong mid-range torque and top-end power, making them a great choice for performance street cars and mild racing applications. Their high-flowing CNC-ported design ensures excellent airflow, supporting up to 6500 RPM. Recommended for small-block Chevy engines with displacements up to 400 cubic inches.