The V-16 "Series 90" and V-12 "Series 80 and 85", were essentially merged for 1938 with the introduction of the new L-head V-16. The new engine was an "L Head" (AKA flathead) design, and featured a wider (135 degree) v-angle, twin carburetors, twin fuel pumps, twin distributors,twin water pumps and a nine main bearing crankshaft (compared to the OHV V-16's five bearing crank) and produced the same 185 hp (138 kW) as later versions of the original V-16 with even greater smoothness and endowed the '38-'40 Sixteens with the swiftest acceleration of any car in the world at the time regardless of weight as well as slightly improved fuel economy over the OHV V-16 cars. This engine was nearly silent at idle and turbine-smooth in operation. The wheelbase was reduced to 141.0 in (3,581 mm), the body remained 222.0 in (5,639 mm) in overall length. The "Sixteens" (as Cadillac referred to them) were basically series 75 cars with the new V-16 engine although they differed from the firewall forward from the V-8 cars and had several other trim differences. The instrument panels were identical to and changed yearly with the V-8 cars from 1938 to 1940. Only the '38 Sixteens had a horn button which had "Sixteen" in art deco script; the '39 and '40 models, like the V-8 had the Cadillac crest on the button. 315 were sold in the first year, 138 in the next. The production of the 1940 models ended in December 1939.