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The HL Flange side is 0.310" thick with a 1.125" bore. The pulse is also added to provide consistent operation of the carburetor diaphragm.
The Universal Side is 0.850" thick this allows the flange to be machined at different angles or different lengths to fit your application. The bore on the universal side is 1.110 bore. There are no holes on the universal side to fit most bolt spacings and to allow any carburetor orientation.
The EC Universal Intake is machined from billet aluminum. There is no pulse hole for external fuel pumps
When choosing your carburetor for a universal application it's important to find the closest available design or blueprinted carburetor. The Tillotson HL-380 is designed for open flatheads on methanol so running this as a gas carburetor or on an OHV, OHC, or 2-cycle is not ideal. We recommend using our X380 Intimidators because of their superior design and more available tunings. If you need help selecting a carburetor you can contact us.