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  1. L31 Vortec OEM pistons

    Engine
    Tried to search for the answer, got hundreds of hits but nothing in the first two pages seemed to answer my questions. 1. Is there any difference in the pistons between a 1/2-ton specced Vortec 5.7L, and the 8,600+ GVWR 3/4--1-ton Vortec 5.7L? As far as I can tell, GM offers two...
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