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The Vortec heads come with a very efficient 64cc chamber using 1.94/1.50-inch valves. Despite the conservative valve sizes, these heads flow extremely well in the 0.300- and 0.400-inch valve-lift areas. Both the intake and exhaust valves incorporate a 30-degree back-cut.
Iron Vortec Head

The Vortec heads come with a very efficient 64cc chamber using 1.94/1.50-inch valves. Despite the conservative valve sizes, these heads flow extremely well in the 0.300- and 0.400-inch valve-lift areas. Both the intake and exhaust valves incorporate a 30-degree back-cut.  View Related Article

 

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