Subaru 1600 and 1800 OHV (EA81) Carburetor Conversion Kit. Any search for the ideal 2-barrel, progressive down-draft carburetor would surely end with the DGEV Series. Designed for engines displacing 1200cc-2300cc, the DGEV Series carbs feature diaphragm type accelerator pump circuits and models with manual, water or electric choke actuation.