Depends on what year LS6
The 1970 LS6 454cid was rated at 450hp/500 lb-ft. Actual hp was around 500.
The 2001 LS6 produced 385 bhp (287 kW) and 385 lb·ft (522 N·m), but the engine was modified for 2002 through 2004 to produce 405 bhp (302 kW) and 400 lb·ft (542 N·m) of torque.
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