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Thread: Max bore of 4.8 liter block

  1. #1
    Join Date
    Jun 2006
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    The Socialist Union of Canada
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    Never mind. I found it.

  2. #2
    Join Date
    Apr 2003
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    Mansfield, Texas, USA
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    2,462
    If anyone else cares, I've seen them taken out to about 3.9"
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  3. #3
    Join Date
    Nov 2003
    Location
    Denton Texas
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    20,540
    The 5.3 and 4.8 are the same block and bore. The 5.3s get bored to 5.7L all the time if the block doesn't have "core shift". 3.908 is the LS1 overbore size or +.010" oversize. So, you can swap the 4.8L crank out for a 5.3/5.7/6.0 crank rods and pistons with machine work to the bores. You leave the stock 4.8L crank in there and have a high revving engine, also, with big 3.898/3.908 pistons. I think I'd do the 5.7L out of it.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

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