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Message: <blockquote data-quote="fastgtfairlane" data-source="post: 283153" data-attributes="member: 9545"><p>actually the main difference between the gt40 and gt40p head is the location of the sparkplug. the gt40 sparkplug is angled like the normal windsor head and the gt40p head the plug pointing out almost straight. that is why regular headers technically will not work. i had gt40p heads on my 68 torino with regular longtubes and it fit ok. i never burned up anywires but i used 90degree boots and have a special wrench to get the plugs out. i believe the difference in flow between the gt40 and gt40p head is minimal. i would stick with the regular head so you can use your regular headers.</p></blockquote><p></p>