Breathe Deep
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Valves are one-piece stainless steel from SI with 11/32 stems and the valve length is 6.500 inches as compared with the factory Ram Air IV at 5.200. The valve job for these heads consists of three angles on the seat and three on the valve. Though I pushed for exact numbers, Don wasn't going to give them up stating that one of the cuts was worth a 40-cfm increase in airflow. Of course the purchaser will benefit from them but competing head porters will have to buy a set and measure for themselves. View Related Article
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