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I think it's .044 inch, but don't quote me on that. Any manual should have that information. If print manuals are too passe for you, the vehicle repair guides at www.autozone.com are an electronic equivalent of a Chiltons manual.
Most parts stores will have that information in their computer, and can tell you the gap when you buy the plugs (if you trust their computer).
There should be a sticker under the hood with the gap on it, too, but stickers don't last forever. I
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.