SBC M23 23 Deg Cyl Head 223cc A/P Bare

The SBC M23 23 Deg Cyl Head 223cc A/P Bare from Frankenstein Engine Dynamics is a premium small-block Chevrolet cylinder head engineered for serious engine builders and performance enthusiasts seeking maximum flow and reliability. This bare casting serves as the foundation for custom-built SBC engines destined for street performance, racing, or high-output street/strip applications. The 23-degree valve angle design represents an optimal balance between intake port efficiency and combustion chamber architecture, making it an ideal choice for builders who demand both power and tunability without factory limitations.

The 223cc intake port volume is specifically engineered to deliver exceptional flow characteristics across the RPM band, enabling better cylinder charging and combustion efficiency compared to stock castings. This cubic centimeter measurement directly correlates to airflow velocity and port velocity optimization—critical factors that determine volumetric efficiency and peak horsepower potential. The bare casting arrives unfinished, allowing builders complete control over valve sizing, seat angles, and port matching strategies tailored to their specific camshaft profile and intake manifold combination. This flexibility is invaluable for precision tuning, as each engine combination requires individualized port geometry optimization to maximize performance gains.

This casting is ideal for engine builders restoring classic Chevrolets, constructing crate engine packages, or upgrading existing small-block platforms seeking improved breathing and power output. The M23 head design accommodates modern performance camshafts, roller valve trains, and high-flow intake manifolds, making it compatible with both vintage and contemporary engine management systems. Professional machinists and experienced enthusiasts typically pair this head with precision porting work and valve job specifications to unlock its full potential. Weighing 25.58 pounds and measuring 12 x 10.5 x 26.5 inches, it integrates seamlessly into standard SBC engine blocks, providing the foundation for builds ranging from mild street engines to aggressive performance platforms.