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The spigot end allows the HL Tillotson Carburetor to be attached to any engine with a spigot-style intake making it a semi-universal intake.
It fits only a 1.00" Bore with a pulse hole in the flange to fit a Tillotson HL Carburetors. The 447INT has a 1.00" throttle bore with a 1.500" OD spigot so you can mount with a hose type insulator to a similar mount on the engine.