In May of 1961 BMC upgraded the Healey 3000 to MkII with three SU HS4 carburettors, modified valve springs and a new camshaft, the radiator grille was changed from the wavy lines of the Austin grille to simple vertical slats. Like the MkI before it the car's bodywork was made by Jensen Motors and the vehicles were assembled at BMC's MG Works in Abingdon, alongside the corporation's MG models.

The MKII was initially offered as an occasional 4-seat roadster called the BT7 or the 2-seat variant known as the BN7. Both versions used flat windscreens and detachable side curtains in the style of a roadster. The rear panel of the BT7 was cut out much deeper towards the boot to make room of the small jump seats in the rear. As a result, almost all the road race and rally cars were built on the BN7 platform.

Like the earlier 3000s, the MKII featured BMC’s C-Series six-cylinder engine with a 4-speed + overdrive gearbox. It used a separate ladder-type chassis and a steel body. MKII configuration changed significantly in 1962 with the introduction of the BJ7 Sports Convertible. It replaced both models with a fully-collapsible soft top, wind-up windows and a curved windscreen. This modernized the car substantially and the BJ7 is more desirable as a touring car. Production continued to 1964 when the MkIII was released.