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The PRC Stage I heads showed gains of 48 hp and 25 ft-lbs of torque over the stock "853" casting cylinder heads. With horsepower peaks of 529.5 at 6,600 rpm and torque of 464.3 lb-ft, this budget LS1 gained 129 hp and 53 ft-lbs of torque with heads, cam, and some tuning. In the world of rear wheel horsepower, this will take the average F-body with a free-flowing exhaust into the 450-460 range on a Dynojet chassis dynamometer. View Related Article
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