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Standard 4.2L had 275 hp. A Trailblazer EXT had a optional 5.3L which had 290 hp.
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How much horsepower does a 2003 Chevy duramax have stock?
300hp
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try this website --->www.trailvoy.com<--- they have alot of stuff to help you with your trailblazer i should know im a member my self i have a 2003 Chevy trailblazer Lt www.trailvoy.com
