Inside the 455 Super Duty
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Initial plans for the SD-455 included a cast-aluminum intake manifold similar to that found on the R/A-IV and 455 H.O. engines. But, according to McCully and Hicks, it was ultimately rejected because of poor cold-weather operation and subsequent emissions output. The production SD intake was cast iron and featured larger runners that matched the taller cylinder head intake ports. A new Rochester Quadrajet carburetor with larger primaries for an increased flow capacity of 800 cfm was also used. View Related Article
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