Emigration of GGP's from Norway

My great grandparents Erik (Errick) Danielson and Kristi (Kresti/Christi) Torstensdatter with three children: Martin, Thorvald (Thorwel) and Anne Dorthea emigrated from Norway 2 May 1961. They left from the Hønefoss- Ask vicinity. I have been unable to find what port they emigrated from, what ship they may have sailed on or at what port they entered the United States. I have tried all the different names and spellings with the Forum emigration list but can get no matches. Would appreciate any suggestions. Don[:D]