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Need help! with 1g 6 and 7 bolt interchange

Posted by Harley5hd, Jan 3, 2018

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  1. Harley5hd

    Harley5hd Probationary Member

    Joined Jan 3, 2018
    Tulsa, Oklahoma
    I have a 94 gst. I bought the car not running. Guy told me that it had a 6 bolt swap in it with a 7 bolt head. Well I pulled the engine and it is a 6 bolt crank. And I'm gonna assume that the block is a 6 bolt block bc all internals were stock and stock bore. So my question is. Will a 7 bolt head work on a 6 bolt block? And how can I tell the difference between the 6 and 7 bolt head, and 6 and 7 bolt blocks.. And what will I have to do to make it run properly?. I have a rebuild kit already and I'm going to go .020 over. Nothing to crazy. Just want a fun daily driver.

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  2. motomattx

    motomattx Proven Member

    Joined Dec 9, 2010
    wampum, Pennsylvania
    Depends on if its a 1g seven bolt head or a 2g seven bolt head, the 1g seven bolt head is for the most part the same as the 1g six bolt head, the 2g seven bolt head has smaller intake ports but can work on the six bolt block if you open up the head bolt holes in it as the 2g seven bolt head uses smaller bolt holes. There are many threads on how to tell the difference between the six bolt and seven bolt blocks.
    My DSM:
    1995 Mitsubishi Eclipse GST

    Drag Race Build

    GT42   manual
  3. chrysler kid

    chrysler kid Proven Member

    Joined Dec 20, 2002
    Mckinney, Texas
  4. 19Eclipse90

    19Eclipse90 DSM Wiseman

    Joined Sep 29, 2003
    OKC, Oklahoma

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