CNC-ported Three-Valve cylinder heads stood out during our visit with Brian Tooley of Total Engine Airflow [(330) 634-2155; www.totalengineairflow.com]. According to Brian, TEA's Stage 1 Three-Valves offer significant airflow gains (over stock) on both sides (287 at 0.600 intake/223 at 0.600 exhaust). When paired with a set of stout camshafts, they will awaken a sleepy S197 with a big increase in power.