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turbo size for 302 gmc six

Discussion in 'Newbie and Basic Turbo Tech Forum' started by badsix, Jun 16, 2024.

  1. badsix

    Joined:
    Jun 16, 2024
    i'm putting a 302 GMC inline six in my 31 chevy pickup project and would like to turbo it. i'm lost as to what size i need. I can build the engine to work with a turbo its just going to be a street car and will never see 5500rpms it has a 5spd. trans. thinking of a draw through ?? any ideas will be appreciated. i'm not new to boost just turbos! my other boosted car a 302 1949.jpg #ad
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    Jay D.
     
  2. B E N

    Joined:
    Nov 22, 2016
    Depends a little on the power goals, but something around an s362 would probably work pretty well on the street.
     
    tbird likes this.
  3. badsix

    Joined:
    Jun 16, 2024
    thanks for the reply, i'm thinking of about 250-300 hp with boost coming on at about 2000-2500rpms and a limit to 5000 rpms.
    Jay D.
     
  4. Forcefed86

    Joined:
    Nov 24, 2005
    Most T4 60*ish mm turbos should get ya ballpark. If you want it really responsive without RPM, go small. The T4 GT3582 would prob be plenty for 5000 rpm.

    Personally I’d want to put a decent cam in it and rev it a little higher. Local here has the record for the SBE inline 300 fords. He was able to rev it quite a bit higher and ran silly amounts of boost. He has a “built” motor in it now and is really leaning on it. Super impressive setup!

     
    Briansshop and tbird like this.
  5. badsix

    Joined:
    Jun 16, 2024
     
  6. badsix

    Joined:
    Jun 16, 2024
    this.
     
    Last edited: Jun 18, 2024
  7. badsix

    Joined:
    Jun 16, 2024
    the 300 ford six is a much stronger engine that the gmc.
    Jay D.
     
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