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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.
Fits only 1.125"(Pulse hole will not line up on 1.00" or 1.060" Carburetors) Bore with pulse hole in the flange to fit a Tillotson HL Carburetors. The 446INT has a 1.125" throttle bore with a 1.500" OD spigot so you can mount with a hose type insulator to a similar mount on the engine.