GenX 220 GM 5.7L LS1 Cylinder Head

The Trick Flow GenX 220 cylinder head offers significant performance enhancements for GM LS1 engines. These assembled cylinder heads are built with a "Fast As Cast" technology, replicating the port shape and airflow characteristics of fully CNC-ported heads, providing a substantial performance boost at a more accessible price point. The design includes 13.5-degree valve angles to reduce valve shrouding and improve mid-lift airflow, along with relocated spark plugs for optimal combustion. Key features of these Trick Flow GenX 220 heads include CNC-profiled combustion chambers with port-to-valve seat blending, enhanced rocker arm and valve cover clearance, and a rigid casting design. The heads come equipped with 2.040-inch intake valves and 1.570-inch exhaust valves, capable of handling up to 0.650-inch maximum valve lift. Materials include aluminum for the head casting, chromoly steel for the retainers, bronze for valve guides, and ductile iron for valve seats. The intake runner volume is 220cc, and the exhaust runner volume is 80cc, with a 64cc combustion chamber volume. These cylinder heads are designed for LS1-based engines and require a minimum bore diameter of 3.900 inches. They are compatible with pedestal rocker arm mounting styles. The heads are emissions-legal under CARB E.O. #D-747 for 1997-present GM vehicles with 5.7L and 6.0L engines. It is important to note that these heads must be used with roller rocker arms. For optimal performance and longevity, consider recommended components such as Harland Sharp SLS17 roller rocker arms.