ALUM25068AP2.08/1.601.290

Dart's CNC LS1 head is machined on a dedicated casting with extra thick sections to maintain proper wall thickness after porting. Recommended for use on engines with 4.000 inch and larger cylinder bores due to large intake valves. Features precise computer-controlled machining, multi-angle intake seats, and radiused exhaust seats for enhanced airflow. Made from virgin 355-T61 aerospace alloy for superior strength. Includes fully CNC machined 250cc intake ports and 68cc combustion chambers. Racing-inspired combustion chamber improves flame propagation. Additional metal above the ports accommodates valve train upgrades. Manganese bronze valve guides and interlocking hardened valve seats ensure long-term reliability. Includes 2.08 inch intake and 1.60 inch exhaust valves. Sold individually.