03-18-2008, 05:24 AM
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Senior Club Cobra Member
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Join Date: Feb 2006
Location: McKinney,
TX
Cobra Make, Engine: SPF #867 gone....
Posts: 1,272
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Not Ranked
I have the old-style GT-40 head. They've made 2 rounds of improvements on that head and come out with the 'z' head since then. It's the difference between the 430 hp crate motor and the 475 hp version.
http://www.fordracingparts.com/parts...tKeyField=6442
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MadMiles442 
She said, "The only thing I'll ask of you, you gotta promise not to stop when I say when..."
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