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3 The test engine is a small block Chevy with a 600-cfm Holley carb that produces 530 lb-ft of torque at 5,200 rpm and 620 horsepower at 7,000. Dorton had mounted up a set of stainless steel, uncoated headers to the 23-degree cylinder heads. The first step was to get a baseline, so the engine was revved to peak torque and held there until the temperature stopped rising. By that time, as you can tell, the header tubes were beginning to glow red.