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Discussion Starter #1
ok, so i just picked up a set of gt40 heads for extremely cheap. i was told they were off of a 94 lightning. now, i looked at the head database found on this site, and according to that the cobra heads have slightly bigger valves than the gt40 explorer heads. does anyone know if the lightning gt40 heads are the same as the cobras or explorers, or if theyre totally different? thanks
 

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All iron GT40 heads have the same size valves except the exhaust valve in the GT40P head.

GT40 = 1.84"/1.54" (intake/exhaust valve size)
GT40P = 1.84"/1.46"
non-GT40/P = 1.78"/1.46"
 

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Discussion Starter #3
FoxChassis said:
All iron GT40 heads have the same size valves except the exhaust valve in the GT40P head.

GT40 = 1.84"/1.54" (intake/exhaust valve size)
GT40P = 1.84"/1.46"
non-GT40/P = 1.78"/1.46"
ok, so which ones come on a 94 lightning then?
 

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Same as on the Cobra except with a larger combustion chamber.
 
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