BBC 357cc CNC Alum Heads Magnum 121cc Assembled

The Air Flow Research BBC 357cc CNC Aluminum Heads Magnum 121cc Assembled (part number 2010-TI) is a high-performance cylinder head designed for Big Block Chevy engines requiring serious power output. This pair of assembled cylinder heads combines precision CNC manufacturing with premium aluminum construction to deliver the port flow and chamber efficiency demanded by competitive builders and high-displacement engine platforms.

The 357cc intake runner volume is engineered for optimal flow characteristics across the RPM band typical of large-displacement Chevy applications, while the 121cc combustion chamber balances compression efficiency with fuel distribution. The 2.300-inch intake and 1.880-inch exhaust valve configuration supports both naturally aspirated and forced-induction setups. The 1.625-inch valve spring pocket accommodates aggressive valve events. Angle-plug design improves flame kernel propagation and combustion efficiency, a critical factor in high-output builds where every percentage point of cylinder pressure contributes to overall power production.

These heads serve engine builders, performance shops, and enthusiasts developing BBC platforms for racing, marine, or heavy-duty applications where displacement and power density are primary objectives. The assembled condition reduces lead time—critical when building on a deadline or replacing failed components mid-season. At 98.33 lbs per pair, weight distribution remains favorable in vehicles where engine bay geometry demands compact, efficient power packages.

Air Flow Research is recognized in the performance community for producing heads that balance flow capacity with manufacturing precision. The CNC process ensures port matching consistency and chamber uniformity across the pair—a prerequisite for drivability and reliability in any serious build.