M311 LS3 Cylinder Head Rect-Port Assembled

The Frankenstein Engine Dynamics M311 LS3 Cylinder Head Rect-Port Assembled (Part No. 113004) is a purpose-built, high-performance aluminum cylinder head engineered for LS3-based and GM LS-series engine builds. This fully assembled unit delivers optimized flow characteristics and combustion chamber design for builders and performance enthusiasts seeking reliable power delivery and consistent cylinder-head performance in both street and track applications.

The head features 2.165-inch intake and 1.600-inch exhaust valve diameters paired with a 273 cc intake runner and 71 cc combustion chamber volume. These specifications are calibrated to support mid-range to high-rpm airflow while maintaining efficient low-end responsiveness. The rectangular-port design maximizes intake velocity and promotes smooth transition between intake manifold and cylinder head, a critical factor in sustained power production across the engine's usable band. Weighing 37 lbs, the aluminum construction balances durability with reduced engine weight, an advantage in applications where overall powertrain mass impacts vehicle dynamics or fuel efficiency.

This assembled cylinder head is suited for LS-series engine builders and performance shops preparing complete or partial engine refreshes. Frankenstein Engine Dynamics' build approach appeals to builders seeking aftermarket cylinder head performance without complex custom porting or extended lead times. The M311 LS3 head supports applications ranging from hot-rod builds and supercharged packages to naturally aspirated street engines where cam profile, ignition timing, and fuel management are tuned to the head's flow characteristics. Availability of an assembled, ready-to-install unit reduces build time and simplifies quality control during engine assembly.

LS-series engines remain the platform of choice for power-per-dollar builds across performance segments. Cylinder head selection directly influences achievable peak horsepower, torque delivery, and engine reliability at elevated boost or rpm levels. Frankenstein Engine Dynamics' focus on flow-optimized designs positions the M311 LS3 as a competitive option for builders prioritizing documented airflow performance and compatibility with OEM LS-series block and intake architectures.