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    1. #3
      Join Date
      Dec 2005
      Location
      Birmingham, AL
      Posts
      3,355
      Country Flag: United States
      You should be able to get into the low 400's with a heads/cam on a 5.3, but there is a pretty big difference between 400 and 500 hp. If you are wanting to be at the upper end of that range naturally aspirated, you would do better starting with a 6.0 block. Soend some time looking through ls1tech.com for 5.3 builds.

      Stephen





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