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First of all, you might wish to go back and let folks know what particular engine you are assembling.
Secondly, you can go to Ford and they can provide you with the bolt from their engine catalog. Ford hardware parts have a number all their own, apart from other part numbers and systems. The bolt will be in the valve train and camshaft listing in the 6000 section of their parts catalog.
IF they do not have the bolt, the catalog should also give the bolt size, thread pitch, and bolt length, as well as its hardness.
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.