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Two camshafts would be tested in the engine: GM's Hot Cam and Showroom Stock cam. First up was the Hot Cam, which boasts 0.525-inch lift and 219/228 duration at 0.050-inch lift on a 112-degree centerline. The Showroom Stock cam's specs include 0.570-inch lift and 239/251 duration on a 106.5-degree centerline. The Showroom Stock cam requires valve relief notches in the pistons when used with the LQ4 rotating assembly.