Manifold screw SHCS 3/8-16 x 1-3/8" bright zinc finish. Use to attach S&S Carbs to manifold when the thickness of an additional bracket must be taken into account. NotesS&S manifold carb mounting flanges measure about 1?2" thick. A 1" long screw provides enough thread engagement in the carburetor body when no spacer block, insulator block and/or bottom hole carb mounting bracket is used. If any of these parts are used, add their thickness to 1" to get the proper length of the bolts required. The mounting screws must not bottom out in the carb body, or mounting holes, or protrude through mounting flange so that contact with the carb bowl is made. S&S Part #: 50-0163