R-680B4E Rated at 225 hp (168 kW) at 2100 rpm.[1] R-680BA Rated at 240 hp (180 kW) R-680E3A Rated at 285 hp (213 kW) at 2200 rpm.[1] R-680-6 Rated at 245 hp (183 kW) R-680-13 Rated at 300 hp (220 kW) at 2200 rpm.[1]