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gt40 heads

  1. 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...
  2. 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...