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If there is a phenolic (plastic) spacer, it's purpose is to prevent heat transfer from the engine to the carb....to prevent boil over or vapor lock in the carb. If your intake and exhaust are on the same side, there's even more heat from the exhaust manifold.
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.