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With the factory LS7 intake manifold in place, the 451-cube LSX made 673.4 hp at 6,400 rpm and torque peaked at 601.2 lb-ft at 5,300 rpm on the School of Automotive Machinists' SuperFlow dyno (using Sunoco 100-octane). From 4,400 to 6,500 rpm torque was around 450 lb-ft or higher! This manifold seemed to like 26 degrees of timing on this combination, the AFR was kept at 12.8-13.3. View Related Article
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