The 164 was powered by a OHV straight 6 cylinder engine, the B30. It was a derivative of the proven B20 4 cylinder. Transmission options included a 4 speed (M400), another version with an attached Laycock d'Normanville overdrive (M410) and an 3 speed automatic (Borg Warner BW35).
Only offered as a 4 door saloon (or sedan), the 164 nonetheless shared many components with it's 144 sister. From the windshield rearward, sheetmetal was identical. The front was lengthened 6 inches to accomodate the longer 6 cylinder engine. Because of the shared components between the 140 and 164, several private parties have constructed 2 door and station/estate wagon versions with 164 front ends. Volvo is said to have produced a single 165 Estate which was given to designer Wilsgaard on the event of his retirement from his career at Volvo.