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Look for raised markings on the left side of the carb, toward the front. The numbers identify the diameter of the primary venturis, which determines the general cfm rating.
Look up the venturi size numbers in the sticky thread at the top of this forum for cfm numbers.
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.