1931 Buick Series 50
221 cid, I-8, 77 bhp

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One of the most obvious styling changes for Buick in 1931 was a new radiator cap with a figure 8, denoting that all Buicks now sported straight-8 ohv engines.

The four-door sedan had a 221 cid engine capable of producing 77 hp. The Series 50 replaced the Marquette, a short-lived companion marque for Buick.

Standard equipment now included mechanical brakes, Delco-Remy ignition, and Hotchkiss drive with conventional transmission.

There were six body styles offered in the Series 50.  There were 33,180 Series 50 produced in 1931 at a list price of just under $2000.


  • Series 50 was low-priced Buick; Built on what would have been Marquette chassis
  • Buick advertised its “Valve in Head” motor (overhead valves)
  • First year for Series 50 to use synchromesh transmission
  • Price new: $1,095