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5.7 vortec engine manual8/29/2023 ![]() The engine was used in F-Body vehicles until 2002. The engine was rated at 305-310 horsepower, a rating believed by some to have been conservative. In 1998, GM introduced the LS1 in its F-Body vehicles - the Chevrolet Camaro and Pontiac Firebird Trans Am. The engine was used in the Corvette from 1997 through 2004. In 2001, GM improved the intake and exhaust manifolds, increasing the rating to 350 horsepower (260 kW) and 365 pound-feet of torque (495 Nm). The LS1 was initially introduced in the 1997 Chevrolet Corvette C5, in which it was rated at 345 horsepower (257 kW) at 5,600 rpm and 350 pound-feet of torque (470 Nm) at 4,400 rpm. Other than a similar displacement, external dimensions and rod bearings, the LS1 shared little with the Gen II LT1 engine it replaced. ![]() The 5.7L LS1 introduced the third generation of General Motors’ Small Block V8 engines.
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