Pure Grunt
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When we explained our low-rpm, high-torque dreams to the guys at Dart, they recommended the company's Pro 1 aluminum head castings with 215cc intake runners, 75cc exhaust runners, and 2.05/1.60-inch valves. These flow about 275/180 cfm at 0.600-inch lift and 28 inches of water and are considered serious performance heads for a 383- or 406ci engine. On a 450 they seem tamer: The flow numbers are similar to those of good pocket-ported GM 049 large-oval-port big-block heads but with a smaller cross-section, adding up to the high-velocity heads we were looking for. The Dart Pro 1 215 heads are available with either 64cc or 72cc chambers and straight or angled plugs, and we went with the angle-plug 64cc versions (PN 11511122). View Related Article
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