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With the carbs mounted on the Edelbrock manifold, Speedway Motors' progressive linkage could be installed. This is the reason for the extended throttle shaft on the center carburetor, the linkage allowing the center carb to operate before the front and rear come into operation at part throttle. The Edelbrock C-357-B manifold is designed for 1955-86 262-400ci small-block Chevy motors and has a balanced 180-degree firing order port runner arrangement. It includes an exhaust gas heat riser and the facility for a front oil fill tube.