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  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...
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