 The 76th SBC-3 was re-engined with a 950-hp (708 kW) Wright R-1820-22 nine-cylinder, single-row, air-cooled radial engine driving a three-blade Hamilton Standard propeller and redesignated XSBC-4.The aircraft armament increased to one 0.50-caliber (12.7-mm) fixed machine gun in the right side of the fuselage forward of the pilot and a 0.30-caliber (7.62-mm) flexible machine gun in the rear cockpit.With the more powerful engine, this aircraft could carry a 1,000-lb (454-kg) bomb on the bomb displacement swing located on the centerline of the fuselage.