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The higher the pressure cap, the hotter the engine can run before it boils over. With no cap at all, it will boil over at approx 212 degrees, depending on your altitude. As you pressurize the system, this number goes up.
I don't know what the spec is on these trucks, but most newer vehicles run at least a 15 lb cap. You can run a lower pressure cap if your radiator is in poor shape. I have had some old cars that I ran 7lb caps in to make the old radiator last a little longer.
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.