AFR 23° SBC Cylinder Head 195cc Street Heads, Straight Plug w/Heat Riser, 75cc

AFR’s 195cc "Street" Cylinder Heads are designed for high-performance small block Chevy engines, offering exceptional airflow and power gains. Made from premium A356 aluminum castings, these heads feature 100% CNC ported intake and combustion chambers, ensuring maximum efficiency and performance. Recommended for engines up to 400 cubic inches, these heads operate efficiently up to 6500 RPM. They are also 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
- Max RPM: 6300-6500
- For higher RPM & larger cams, use upgraded spring #8019
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	.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
Intake Port Location: Stock
Exhaust Port Volume: 64cc
Exhaust Port Dimension: 1.450" H x 1.550" W
Exhaust Port Location: .100" Raised
Combustion Chamber Size: 65cc or 75cc
Valve Cover Bolt Pattern: Perimeter Bolt
Valve Angle: 23°
Valve Spring Pocket Diameter: 1.460" O.D
Deck Thickness: .750"
Minimum Bore Diameter: 4.000"
Flat Mill: .006" per cc (Max 60cc)
Angle Mill: .009" per cc (Max 55cc)
Spark Plug Dimensions: 14mm x .750" w/Gasket Seat

Performance & Compatibility

The AFR 195cc SBC Street Cylinder Heads deliver outstanding performance, making them ideal for street and mild performance applications. With their high-flow CNC porting and premium components, they enhance power, efficiency, and overall engine responsiveness.