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The World Castings heads were also treated to Extrude Hone porting and were equipped with a 2.02/1.60 valve combination. The ported heads flowed 275 cfm at 0.600 valve lift through each intake port and 235 cfm at 0.600 valve lift through each exhaust port. The ported heads offered plenty of flow for both the 302 and the 347. By running the comparison with a ported head, we made sure the head flow would not restrict the larger motor and skew the test results.