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Thread: 5.3 vs 4.8 difference.....and what is the goo on piston?

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  1. 05-19-2021 #1
    Fast355
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    Quote Originally Posted by brian617 View Post
    4.8 FLAT TOP, 5.3 DISH

    RUSTY WATER?
    Not necessarily!

    I have found engines swapped in place of others many times. These trucks are 20 years old now.
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  2. 05-19-2021 #2
    In-Tech
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    ~2006 and up 5.3 are flat top pistons. It's a good way to tell at a glance in the junkyard though.
    -Carl
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« DBW Cruize Control | 1999 5.3L vs 2004 5.3L (L59) PCM differences »

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