 In 1927, Mutsu's bow was remodeled to reduce the amount of spray produced when steaming into a head sea. This increased her overall length by 1.59 meters (5 ft 3 in) to 217.39 meters (713 ft 3 in). This proved successful and her sister's bow was rebuilt in 1930. During their 1934 – 36 reconstruction, the ships' sterns were lengthened by 7.55 meters (24.8 ft) to improve their speed and their forward superstructures were rebuilt into a pagoda mast. They were given torpedo bulges to improve their underwater protection and to compensate for the weight of the additional armor and equipment. These changes increased their overall length to 224.94 m (738.0 ft), their beam to 34.6 m (113 ft 6 in) and their draft to 9.49 meters (31 ft 2 in). Their displacement increased over 7,000 metric tons (6,900 long tons) to 46,690 metric tons (45,950 long tons) at deep load.
