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  1. Vintage Mustang Forum
    Hi Everyone I am installing GT40 heads milled 30 thou on 68 302 for my mustang. Looking at the specs I am looking at using a 0.029 in compressed thickness head gasket. I believe that this is in spec to maintain reasonable compression but I have not seen on the forum post installation details or...
  2. Vintage Mustang Forum
    So I am pretty new to building engines and i have a 79 302 block that i am putting gt40 heads on. When I go to tighten down the rocker arms, the bolt bottoms out while the rocker is still loose. I got all the valvetrain from the machine shop that I bought the heads from and they’re no help...
  3. Vintage Mustang Forum
    Hi im new here and im building a 65 289 block with a stroker 347 kit from summit racing. i have a set of factory 289 heads and a set of gt40 off a explorer. iv read about compresion lost on the gt40 heads but better flow i already did some machine work on the 289 heads, larger ss valves. anbody...
  4. Vintage Mustang Forum
    I have a 66 mustang that I am swapping a 68 302 into. I bought a pair of GT40 heads, not gt40p, and I was looking to see what all I need to make them fit on my motor that has a .475/.475 cam, flat top pistons, and a weiand stealth intake manifold? I was planning to use JEGS long tube headers...
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