RE2A-5S is a part of World Products, a popular source of engine components, including camshafts, lifters, springs, pistons, and blocks. The RE2A-5S is a small block Chevy casting cylinder head, designed for applications ranging from street rods and performance engines. It features large valves and a shallow chamber, as well as raised exhaust port roofs for increased airflow. The RE2A-5S is known for its durability and performance.