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  1. Engine
    Hi I am new here and i am building building a chevy 307 with vortec heads for my brother. The question is; which cam should i use with these vortec stock valve springs? I have read that these heads have a limit, about the max lift they can handle, but i want to put a nice hydraulic flat tappet...
  2. 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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