Im hoping to have flowbench data this evening for both the 848 Chevy head and the 302 GMC head. I had to make some pieces for the intake ports to form a radiused entry for the air leading into it. This helps simulate a manifold being attached to the head, and gives a smoother,more consistent flow into the port,and is standard procedure for flowing intake ports,as is bolting a short piece of tubing to the exhaust port to simulate the transition from head to header....
