Among the newly-confirmed artists are Magnetic Man, Jamie xx, A Guy Called Gerald and a full Modeselektion lineup featuring Ben Klock, Modeselektor, Apparat, Ramadanman, Ikonika, Siriusmo and Daniel Meteo.
"Bloc is feeling all festive - and to celebrate they've just announced more acts added to the heaviest lineup of 2011," an official statement read.
"To put it bluntly, if you miss out on this one your festival season won't be worth living. Packed full of dance music big legends, forward-thinking experimentalists and heavyweight party people, the Bloc 2011 lineup is definitely one not to miss."
Previously announced artists for the event at Butlins, Minehead on March 11-13 include Aphex Twin, Vitalic, Claude Von Stroke and LFO.