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A good set of heads is essential to airflow. Aluminum aftermarket heads may support higher flow numbers, but for those on a tight budget, the ports in most 360 heads offer flow characteristics far superior to those found in stock 318 castings. To increase the airflow, Andy Giles performed a mild porting job, and 2.02 and 1.60 valves were installed. Also, new valvesprings were installed to the cam manufacturer's recommendations.