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After tuning, the Mast Motorsports heads proved they were worth 46 rwhp and 22 lb-ft of torque (452 hp at 6,500 rpm and 400 lb-ft at 4,600 rpm). Peak torque was still at 4,600 rpm but peak power climbed up the ladder 200 rpm to broaden the power band. Looking at the dyno graph, you can see how power improved along the entire dyno pull. With these great gains, we were anxious to go to the track the next day.