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The desirable Cobra Jet head (D0OE-R) yields 2.19-inch intake and 1.73-inch exhaust valves. Port size is a whopping 2.51x2.11-inch intake and 2.25x1.30-inch exhaust. If you can’t find this head, opt for the ’73-’74 Police Interceptor head (D2OE-AA, D2OE-AB, or D3AE-FA) which has the same valve and intake port size, and a slightly smaller exhaust port. That slightly smaller exhaust port improves torque.