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0405htp Drag 02 Z

Stock as a rock, our automatic-tranny 2004 GTO mustered 290.4 horsepower and 297.6 lb.-ft. at the rear wheels. As this equates to about 363 horses at the engine, it is clear that GM is still underrating the LS1 engine a bit, which in this application they say puts out 350 horsepower. Fact and fiction comparisons aside, it's a good place to start.
2004 Pontiac GTO - Back in Black

 Stock as a rock, our automatic-tranny 2004 GTO mustered 290.4 horsepower and 297.6 lb.-ft. at the rear wheels. As this equates to about 363 horses at the engine, it is clear that GM is still underrating the LS1 engine a bit, which in this application they say puts out 350 horsepower. Fact and fiction comparisons aside, it's a good place to start.  View Related Article

 

 

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