The 70 series Buick came with a four barrel as factory equipment in 1952, 1953, and 1954. Several different Carter model WCFB's and Stromberg (yes Virginia, Stromberg made a four barrel, and it was a good one) model 4-A's.
The Buick compound carburetion was available in 1941 and 1942 on either the small or large engine. Carbs used were either Carter WCD or Stromberg AA series. The compound carburetion was set up as a "progressive" system with a normal primary carb, and a "dumper" secondary carb.
Buick tested a version of compound carburetion as early as 1935 with 2 Stromberg 1 barrel carbs being used experimentally. The 2 1 barrel version never made production.
Jon.
