Speedmaster PCE281.1275 SBC 350 Aluminum Cylinder Head 217cc 74cc Angle Plug CNC

The Speedmaster PCE281.1275 is a high-performance bare aluminum cylinder head designed for Small Block Chevy 350 engines. This fully CNC-machined head features a 23-degree valve angle configuration with angled spark plug holes, 217cc intake runners, and 74cc combustion chambers for optimized airflow and compression control.

Key Specifications:

• Intake runner volume: 217cc for excellent mid-range to high-RPM flow
• Combustion chamber volume: 74cc for precise compression ratio tuning
• Valve angle: 23-degree design for traditional SBC performance
• Spark plug configuration: Angled plug design for improved accessibility
• Valve sizes: 2.020" intake / 1.60" exhaust (both +.100" length)
• Accepts up to 2.05" intake valves with minimal machine work

CNC Machining Advantages:

• Full CNC machining of combustion chambers, intake ports, and exhaust ports on dedicated 4-axis and 5-axis CNC centers
• Exact combustion chamber volumes ensure identical compression ratios across all cylinders
• Eliminates port-to-port variation and human error common in hand-ported heads
• Superior repeatability and consistency from head to head
• Precise control over flame travel and quench area for improved combustion efficiency

This bare cylinder head is sold as-is without valvetrain components, allowing builders to customize with their preferred springs, retainers, and valves. Ideal for street performance, bracket racing, and engine builds targeting 400-500+ horsepower with proper combination of components.