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    Thread: Ls3 cfm

    1. #1
      Join Date
      Mar 2008
      Location
      Chicago suburbs
      Posts
      667
      Country Flag: United States

      Ls3 cfm

      I have a very basic question, but can't seem to find a reliable answer. How much CFM does a mild LS3 need? I'm afraid my small K&N universal filter may be too small.



    2. #2
      Join Date
      Sep 2010
      Location
      Beach Park IL
      Posts
      2,838
      Country Flag: United States
      (CID x max rpm x VE) / 3456

      636 cfm give you some headroom. KN says 6 cfm per square inch so you would need 10.5 square inches.

      Here is a calculator https://racingcalcs.com/cfm-cubic-fe...te-calculator/
      Donny

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