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  1. #1
    Join Date
    Nov 2018
    Posts
    1
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    5.7 to 392 rotating assembly

    Good afternoon. I'm hoping this is the right place to post this seeing how this is my first post on the forum. Moving along. I have recently put a 426 stroker kit into my 392. This leaves me with a perfectly good factory 392 assembly. So my question is has anyone put one of these in an eagle 5.7 instead of the aftermarket stroker kits? And or if you know why it wouldn't work that info would greatly help. Thanks

  2. #2
    Join Date
    Sep 2013
    Location
    Harlingen, Texas
    Posts
    20
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    The 5.7 block can't be bored large enough for the 392 pistons

  3. #3
    Join Date
    Dec 2016
    Location
    Charlotte NC
    Posts
    288
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    A factory 392 is a different bore and stroke than an aftermarket 392 stroker set up and won't go into a 5.7 block.

  4. #4
    Join Date
    Jan 2017
    Posts
    109
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    Eagle Blocks are limited to a max bore of 3.96 , that leaves about .110-.120 in the cylinder walls. the Early 03-08 5.7 blocks can and HAVE been bored out to 4.00 safely IF there is no to little core shift ,you can go as large as 4.06 if the core didn't shift during casting...BUT ALWAYS SONIC CHECK . I have one here right now that has been bored to stock 6.1 bore(4.055) with .189 wall thickness in the thrust direction. I've gone 4.08 on 7 different 5.7 block based builds, one did crack but that was my fault for pushing it, in hindsight the sonic test warned me that it was a possibility . I took one out to 4.09 I do not recommended it , in the end I had to hard block it, it's still running strong but it's a drag only car.NONE OF THESE ARE BOOST Builds.SONIC test the block before any over 4.0 bore is attempted......again I"LL REPETE IT SONIC CHECK BEFORE ATTEMPTING.

  5. #5
    Join Date
    Mar 2014
    Location
    maryland eastern shore
    Posts
    1,991
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    Quote Originally Posted by ric3xrt View Post
    Eagle Blocks are limited to a max bore of 3.96 , that leaves about .110-.120 in the cylinder walls. the Early 03-08 5.7 blocks can and HAVE been bored out to 4.00 safely IF there is no to little core shift ,you can go as large as 4.06 if the core didn't shift during casting...BUT ALWAYS SONIC CHECK . I have one here right now that has been bored to stock 6.1 bore(4.055) with .189 wall thickness in the thrust direction. I've gone 4.08 on 7 different 5.7 block based builds, one did crack but that was my fault for pushing it, in hindsight the sonic test warned me that it was a possibility . I took one out to 4.09 I do not recommended it , in the end I had to hard block it, it's still running strong but it's a drag only car.NONE OF THESE ARE BOOST Builds.SONIC test the block before any over 4.0 bore is attempted......again I"LL REPETE IT SONIC CHECK BEFORE ATTEMPTING.
    Do u have a shop?

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  6. #6
    Join Date
    Jan 2017
    Posts
    109
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    "Do u have a shop?"Working on it, should be up and running by March(2019) and full time by March 2020part of my "day job" is engine building for the company I work for ,mostly dyno mules for testing . and engines for cars the owners race. these guys have been very supportive of my "off the books " type engine builds, for the last 25 years....but it's time I step out on my own



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