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What is the true horsepower rating on a stock 99 ls1 engine

This is a discussion on What is the true horsepower rating on a stock 99 ls1 engine within the General Help forums, part of the LSx Technical Help Section category; Can someone tell me the true horsepower rating on the stock ls1 engine in the 99 trans am.I here 305-315 ...

  1. #1
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    pewter
    99 Trans Am

    Question What is the true horsepower rating on a stock 99 ls1 engine

    Can someone tell me the true horsepower rating on the stock ls1 engine in the 99 trans am.I here 305-315 what is it really? or do anyone really know.

  2. #2
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    pajeff02's Avatar
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    '02 WS.6 / '07 Suburban

    I think that 305 and 325 are the most commonly quoted horsepower ratings for that year, the latter being the WS.6 cars.

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