Well after the carnage in NMRA Ohio last weekend, Im in search of some untouched stock GT40 Iron heads, if anyone has 1 or a pair of heads, im looking, PM please.
Some Explorer heads have the same casting # as the '93 Cobra ones,like the ones I have (F3ZE-AA),and are also drilled for smog,but have the thermactor plugs on both ends.I know the actual Cobra heads were milled down at the factory though.Wrong!
The Cobra ones have smaller chambers and drilled for smog..
Hmmm,well,from everything I've researched there seem to be a lot of variations on them.I cc'ed mine,and they came out to 63 cc's,but they are in the machine shop getting milled down .030 at the moment.:evilgrin:Original 93 Cobra had F1 castings.The chamber is 61-63cc.The 3 sets of 96 Explorer heads I have had no smog holes drilled.Not saying some might of but in my experience they were not.94-95 Cobra heads did have F3 castings as did the lightnings.
this should give you an idea of what happend.What happened at Ohio? pics of the carnage John.