There were changes, however, albeit small ones. A facelift in 1975 gave the Marina new radiator grilles, dashboard, seats, suspension modifications and increased soundproofing. In May 1977 Marinas started to appear at dealers equipped with Allegro style seats: apart from rationalising the procuring and production processes, this was said to make the Marina seating more comfortable and supportive. The overhead camshaft O-Series engine (also used for Leyland Princess) appeared in 1.7-litre form in 1978 to replace the larger B-Series 1.8-litre models. A changed grille, including driving lights, a front spoiler and redesigned bumpers and rear lights, were added to all models.