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Some Tillotson carburetors will come with this style plate from the factory when specific applications do not support pulsing off the flange. If you decide to make the change to this style setup be sure to plug the flange pulse hole. If both are vacuum ports are open this may cause irregularities in the pumping action of the carburetor.
This is a standard volume, or what many call a single stack or gas plate stack, style pump plate. This external pulse plate works with any Standard Volume(Single Stack, Gas) pump plate carburetor. Check your carburetor and carburetor listing before ordering.