Alum Cyl Head CNC GM LS1 65cc A/P 225cc Bare

The Trick Flow GenX® 225 Cathedral Port Cylinder Heads are fully CNC-machined for GM 6.0L LS2 engines. They feature altered valve angles (from 15° to 13.5°) to reduce valve shrouding and improve mid-lift airflow. Additional material at the rocker arm mounting points enhances high-rpm valvetrain stability. Spark plugs are relocated in CNC-profiled combustion chambers for better mid-lift airflow and casting rigidity. These cylinder heads are emissions-legal under CARB E.O. #D-747 for 1997-present GM vehicles with 4.8L, 5.3L, 5.7L, and 6.0L engines. They are sold individually and are available fully assembled or as bare castings. Minimum bore diameter of 4.000 in. is required.