Towards the end of the war, attacking special and hardened targets, other variants of B I Specials were modified to carry the 21 ft (6.4 m) long 12,000 lb (5,450 kg)''Tallboy'' or 25.5 ft (7.77 m) long 22,000 lb (9,980 kg)'' Grand Slam '' earthquake" bombs: to carry the "Grand Slam" extensive modifications to the aircraft were required. The modifications included removal of the mid-upper turret and the removal of two guns from the rear turret; removal of the cockpit armour plating (the pilot's seatback) and installation of Rolls-Royce Merlin Mk 24 Engines which had better take-off performance. The bomb bay doors were removed and the rear end of the bomb bay cut away to clear the tail of the bomb. Later the nose turret was also removed to further improve performance. The undercarriage was strengthened and stronger mainwheels

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