Gen III Hemi 212cc LH Cyl Head 73cc CNC Assem

The Gen III Hemi 212cc LH Cyl Head 73cc CNC Assem is a precision-engineered cylinder head designed for serious Mopar Gen III Hemi engine builders and high-performance enthusiasts seeking maximum intake flow and chamber efficiency. This driver-side assembled unit serves engine platforms requiring optimized combustion chamber geometry and valve timing characteristics that directly impact horsepower delivery and fuel economy. Whether you're building a street performance application, drag racing platform, or restomod project, this AFR casting provides the flow characteristics and structural integrity demanded by modern forced-induction and naturally aspirated builds.

Manufactured by Air Flow Research—a leader in CNC-ported cylinder head technology—this assembly features a 212 cubic centimeter intake port, 73 cubic centimeter combustion chamber, and dual valve sizes (2.125-inch intake / 1.650-inch exhaust) optimized for Gen III Hemi architecture. The 1.290-inch valve springs provide the spring pressure necessary for reliable valve control across elevated RPM ranges while the straight spark plug location ensures compatibility with modern ignition systems and timing components. CNC-assembled construction guarantees port-to-seat alignment and valve seat concentricity, eliminating flow restrictions and combustion inefficiencies that plague hand-ported alternatives. The aluminum construction weighs 37.3 pounds—critical for engine bay weight distribution in performance and competition builds.

This driver-side cylinder head is essential for Gen III Hemi platform builders upgrading from factory castings or repairing damaged cores. Installation requires proper gasket selection, intake manifold matching, and valve train verification to ensure rocker arm geometry and pushrod length compatibility. Pairing this head with complementary cam profiles, fuel mapping adjustments, and intake manifold optimization unlocks the performance potential inherent in the design. Professional machine shops and engine builders standardize on AFR heads for consistency, reliability, and dyno-proven horsepower gains—making this assembly a critical investment for any serious Gen III Hemi build.