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Though the new Twisted Wedge heads offered plenty of flow in as-cast form, we had ours worked over by the flow wizards at Total Engine Airflow. Since the new R-series 4.6L heads were not yet available, we figured the TEA-ported Track Heat heads would be the next best thing. The boys at TEA concentrated on maximizing the flow rate of both the intake and exhaust ports. When completed, the TEA-ported heads flowed 260 cfm on the intake and 215 cfm on the exhaust.