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It may appear to be a stock 350-horse LS1 but its not. This engine sports LS6 heads and an LS6 cam straight from the GM Performance Parts Catalog. The LS6 cam is PN 12565308 and features 204/218 degrees duration at .050 and .550 lift with a 117.5-degree lobe separation angle compared to the stock cam with 196/207 degrees duration at .050, .479/.467 lift, and a 116-degree LSA. The LS6 heads are PN 12564824 and feature 3cc smaller combustion chambers to increase compression and redesigned ports to improve performance over the LS1 heads.