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Assembled they retail for $269 ea at most speed shops like Summit and Jegs, but I'd pick up a Mustang magazine for more retailers. Central Coast sells them at a decent price, but they are usually worked over...but still "stock". If you are trying to look stock, and want something better than the GT40's, try the Power Heads link in previous threads.
Any GT40p's I buy will be from a junk yard out of an Eplorer, etc.
The reason I need stock GT40 Heads is because I am competing in the NMRA Factory Stock class next season. You have to run either stock E7TEs, stock GT40s or stock GT40Ps. I am not going to run GT40Ps because of the header problem, and I just bought some AFM/Bassani 1 3/4 shorties, and those things aint cheap.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.