Departure point from Norway

My grandfather came to the US on a ship from Liverpool (as a member of the crew). But he would have had to travel to England from Norway first. Can anyone tell me which Norwegian ports had the most ships that traveled to England (ca 1903-4)? Were there ports that served this route more frequently than others? Also, can someone confirm for me whether the emmigrant files at the Digitalarkivet contain crew (or not)? I will appreciate any feedback...