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That sounds like a TRW part number. From what I just found it may be a 428 piston. As a matter of digging everything I found points to them being 428 non-CJ pistons.
Rezvani's Latest Post-Apocalytic 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.
