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The Tillotson Fuel Inlet/Check Valve Gasket goes below the fuel pump diaphragm.
If your gasket is above the diaphragm, this will cause tuning problems and hurt your carburetor's performance.
16B-253 OE Tillotson High Volume Fuel Pump Gasket fits all High Volume(Double Stack, Alky) Pump Plates.
The gasket is .020" Thick