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383 Questions??

Discussion in 'The Garage' started by Bluekrow, Oct 3, 2005.

  1. Bluekrow

    Bluekrow Registered Member

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    I just picked up a 68 GMC short box pickup with a (supposed to be)383 strocker,465 tranny and a 205 transfercase!! Any how I was wondering if there is any way that I can tell without totally disassembling the engine if it is infact a 383?? I've heard that they are suppose to have different harmonic balencers, But if the crank is balenced it can have the same one as a 350??
    Any help on this subject is appreciated, Kelly :1zhelp: :k5:
     
  2. 1977k5

    1977k5 3/4 ton status Vendor

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    The harmonic balancer on a 383 (and 400, of course) is externally balanced, while the one for the 350 is internally balanced. To see if your balancer is externally balanced, look for a few holes to be drilled out of the front of it. If there are no holes, it is internally balanced meaning it is a 350.
     
  3. gmcjimmy90

    gmcjimmy90 Registered Member

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    a 400 balancer will be cut away around the outer ring usually about half way around.
     
  4. trailblazr81

    trailblazr81 1/2 ton status

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    The balancer is the easiest... you can also pull the oil pan and check for machining to clear the rods.
     

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