2004 STi short block casting number question
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This is a discussion on 2004 STi short block casting number question within the STi Engine Performance forums, part of the STi Technical Forum category; Hello all. As my user name might imply, I am in the process of having my 04 STi short blocked. ...

  1. #1
    Registered User
    Join Date
    Oct 2014

    2004 STi short block casting number question

    Hello all. As my user name might imply, I am in the process of having my 04 STi short blocked. From what I have read, the casting number for the latest block was the 703. I have my car at a dealer here in Richmond and they are completing the short block and turbo replacement for me.

    I know the Subaru part number for the short block is: 10103AC030

    I was assuming the casting would be a 703 but my technician tells me it is a 705. Unfortunately, the tech could not tell me if the crank was black indicating a nitride crank.

    Can anyone tell me specifically what the difference is between my original 04 block and the new short block with a 705 casting number?

    Just wondering if the new block will be a down or up-grade.

    Any information would be appreciated!

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  3. #2
    Pro Manscaper Mikie13's Avatar
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    Oct 2006
    Palmyra, NJ
    If I'm not mistaken, the nitrided crank didn't appear until the 2007 STIs.
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