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The LS1 was introduced in the Corvette in 1997, and made its way into the Trans Am and Camaro in 1998. The Camaro Z28 and Trans am were advertised at 305 hp and the SS and WS6 at 320. Ratings stayed the same until 2001. The 01-02 SS and WS6 models were rated at 325 thanks to an LS6 intake manifold borrowed from the Vette. However a slightly smaller cam was used to keep power at the same level. The fact is an ls1 is an ls1 reguardless of year or model. The SS and WS6 cars will NOT dyno higher than a Z28 or ls1 formula. All 98-02 LS1 cars dyno 280-300 with the A4, and 300-320 with the m6. Forget about the GM ratings. All LS1 cars are good for 350-360BHP. GM underrated these motors in order to keep sales up on the "king of the hill" Corvette.

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