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13. Run first with the stock iron heads, the 331 produced 352 hp at 5,300 rpm and 400 lb-ft of torque at 3,800 rpm. Installation of the Edelbrock E-CNC 185 heads pushed power to 449 hp at 6,100 rpm and 444 hp at 4,500 rpm. Since the Edelbrock heads will support 600 hp, there is plenty of power left.