Compression remained unchanged at 6.5:1, displacement rising slightly to 2867cc thanks to a 0.6mm bore increase. Further aero refinements were introduced, the 935 ’77 featuring a more sculptured front bumper, massive wheelarch extensions and a faired in rear spoiler with supplementary cooling dicts either side. The works entries for 1977 were once again campaigned in the distinctive Martini & Rossi livery, Porsche's factory team securing victory in four out of the nine World Championship rounds. The first came at the hands of Rolf Stommelen and Manfred Schurti who took the chequered flag on the ’77's debut at the Mugello 6 Hours. However, at the same event, Porsche’s second example (chassis 004) was heavily crashed and this forced the factory to fabricate a third example (005) for the duration of the season. Jacky Ickx and Jochen Mass were responsible for the three other 935 ’77 wins that year with the Silverstone, Watkins Glen and Brands Hatch six hour events all falling to these expert endurance racers. There was also a fourth 935 ’77 built, but this was a unique 1.4-litre single turbo example constructed specially to compete in the 2-litre class of the German GT Championship.