SBC CNC 18-Deg Cylinder Head 272cc Bare

The DART SBC CNC 18-Degree Cylinder Head with 272cc chamber is a bare aluminum casting engineered for small block Chevy engine builds demanding high-flow intake architecture and optimized combustion geometry. This race-series head features a CNC-ported design with an 18-degree valve angle, 2.180-inch intake valves, and 1.600-inch exhaust valves that maximize volumetric efficiency across the RPM band. The 272cc intake volume and 66cc chamber displacement are sized for serious performance applications where intake velocity and cylinder fill rate directly determine horsepower output and torque characteristics.

The CNC-machined port design ensures precise valve seat concentricity and flow consistency critical for engine builders targeting competitive power targets. The angle-plug configuration allows optimized spark plug positioning for faster flame propagation and improved combustion efficiency. As a bare casting, this head arrives without gaskets, valvetrain components, or installation hardware—allowing builders to specify exact valve lift, spring pressure, and ignition timing to match their specific engine platform and fuel octane. The aluminum construction provides weight reduction compared to iron alternatives while maintaining the thermal stability required for sustained high-RPM operation. At 25.36 pounds, this head is substantially lighter than comparable cast-iron designs, contributing to overall engine bay weight savings in street or competition builds.

This cylinder head is specified for small block Chevy platforms including 350, 383, and 406-cubic-inch displacement engines. Builders choosing a DART race-series head typically pair it with a compatible intake manifold, carburetor or fuel injection system, and precision-matched valvetrain to achieve target power outputs between 450 and 650+ horsepower depending on block displacement, camshaft profile, and fuel system. The 272cc intake volume performs optimally with intake manifolds designed for that chamber size and carburetor sizing matched to engine displacement—oversized manifolds reduce port velocity while undersized manifolds cause flow restrictions. Typical applications include vintage muscle car restorations, off-road engine builds, boat motor conversions, and dyno-tested race engines where flow numbers and chamber volume precision are non-negotiable.