GM LS 15deg Cyl. Heads 230cc Cathedral Port

The GM LS 15deg Cylinder Heads 230cc Cathedral Port from Air Flow Research represents a purpose-built solution for LS engine builders seeking enhanced airflow and combustion chamber efficiency. These cylinder heads are engineered for serious street and race applications where maximizing power output and reliability is non-negotiable. The 15-degree valve angle combined with the cathedral port design creates an optimal flow path that supports both naturally aspirated and forced-induction LS platforms.

AFR's engineering delivers 230cc intake runner volume with precisely optimized port geometry that balances velocity and flow capacity across the entire RPM range. The cathedral port configuration promotes superior combustion chamber design while maintaining structural integrity under extreme cylinder pressure. The 15-degree valve angle allows for compact, efficient combustion chamber shapes that reduce quench distances and improve flame propagation—critical factors for consistent detonation-free operation. These heads are CNC-ported and finished to exacting tolerances, ensuring repeatability across matched pairs and eliminating the variability inherent in manual porting.

Serious LS engine builders—whether assembling a high-output truck platform, street performance engine, or dedicated race motor—will appreciate the proven track record AFR cylinder heads command in the enthusiast community. These heads excel on engines running 10:1 to 11.5:1 compression ratios with modern fuel injection and ignition control. Installation requires proper gasket selection, valve-to-piston clearance verification, and torque-sequence adherence per your block's specifications. Compatibility spans all LS1, LS2, LS3, and similar displacement variants; confirm your specific application before ordering to ensure ideal combustion chamber volume and intake runner matching.