ALUMINUM SMALL BLOCK

Dart Pro 1 CNC Ported Aluminum cylinder heads are designed for maximum performance in high-compression, big-inch small block Chevy engines, including supercharged applications. Each intake port, exhaust runner, valve bowl, and combustion chamber is 100% CNC machined from virgin 355-T61 aerospace alloy for superior strength. These heads retain standard valve angle and spacing for compatibility with off-the-shelf pistons and valvetrain components. They feature 227cc CNC machined intake ports for optimal airflow and fuel suspension, 66cc CNC machined combustion chambers for consistency, and hardened exhaust seats compatible with unleaded gasoline. Manganese bronze intake valve guides and phosphorous bronze exhaust valve guides extend service life. These are angle plug style heads for racing headers and are machined for gasketed 3/4" reach spark plugs. Sold individually.