AFR 180cc/ 75cc Street Cylinder Head Pair SBC

Increased combustion chamber volume can help manage compression in larger Small Block Chevy builds.  This cylinder head utilizes fully CNC-ported intake runners, exhaust runners, and combustion chambers to improve airflow over factory cast-iron heads. It supports street-driven engines up to 383 cubic inches with redlines up to 6,000 RPM.

Cast from A356 aluminum, the cylinder heads reduce overall weight while maintaining strength under sustained heat. A 75cc combustion chamber, 23-degree valve angle, and .100” raised exhaust port location contribute to improved exhaust evacuation and balanced compression. This head is perfect for street builds and is 50-street legal.

Features and Benefits:
- A356 aluminum construction reduces weight and improves heat dissipation
- 180cc intake runners support 383 cubic inch engines
- 75cc combustion chambers balance compression and street drivability
- Fully CNC-ported intake, exhaust, and chambers optimize airflow
- Raised .100" exhaust ports improve flow characteristics
- Machined for center and perimeter bolt valve covers
- 23-degree valve angle maintains Small Block Chevy geometry
- 1.460" O.D. valve spring pockets with machining up to 1.750" O.D.

Specifications:
- Material: A356 aluminum
- Intake port volume: 180cc
- Intake port dimension: 2.050" H x 1.250" W x 5/16 radius
- 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
- Valve cover bolt pattern: perimeter bolt
- Valve angle: 23 degrees
- Valve spring pocket diameter: 1.460" OD
- Max valve spring pocket machining: 1.750" OD (warning: do not machine spring pad any deeper.)

Vehicle Fitment:
- Fits Small Block Chevy Engines