The Lincoln Custom was based on the Lincoln-Zephyr, a smaller, unit-bodied, mid-range priced vehicle introduced in 1936 with a smaller 267 cu. inch V-12 (based on the Ford V-8) while drawing many similarities to the De Luxe Ford.^[1] This engine was enlarged to 292-ci for 1938, 305 ci 1942 only, but reduced to 292 ci after the war for the sake of durability, the "Ford-and-a-half" engine never a paragon of such. This car competed with the Packard Super Eight, Cadillac Sixty Special and Buick Limited while the Lincoln-Zephyr was considered the "junior" introduced in the mid-1930s to a shrinking luxury car market as engineering advances diminished the difference in performance between the outsized earlier luxe and the newer, more rational, affordable offerings. The earlier Lincoln Model K sold 3024 units in 1934, the first year of its production, only 133 units in 1939, 18 in 1940. 1940 saw the Zephyr and the higher priced Continental carrying the Lincoln name.^[2]

The wheelbase of the Lincoln Custom was 138 inches (3.5 m) compared to the Zephyr's 125 inches (3.2 m), and only the seven-passenger sedan or limousine were offered.^[1] The interior choices offered a choice of broadcloth upholstery, while a long list of custom interior choices were available including leather.^[1] The Zephyr and Custom used the same V-12 engine that was enlarged for 1942 to 305 cubic inches (5,000 cc) with 130 horsepower (97 kW). The engine was the weakest point of the 1942 models, being very prone to overheating and premature wear. The 305 cubic inch version was reduced to a 292 cubic inches (4,790 cc), 120 horsepower (89 kW) version after World War II in an attempt to promote longevity. The V-12 was the only engine used in Lincolns until the new 1949 models came out with a flathead V-8 based on a Ford truck engine.

The 168H (1941) and 268H (1942) Lincoln Customs featured two models: the Model 31 eight passenger sedan listed for US$2,950 ($55,011 in 2023 dollars ^[3]) and the model 32 eight passenger limousine listed for US$3,075 ($57,342 in 2023 dollars ^[3]). Differences included a division window and different front seat upholstery for the limousine. Both utilized a three speed transmission with Borg-Warner overdrive and Columbia two-speed rear axle.^[1] A small number were modified by the few custom coach builders left in the United States before the war. The 1942 models introduced power windows to the luxury car field; electric and hydro-electric powered limousine dividers having previously been offered.

Specifications were:^[4]

For 1942, the Zephyr-based waterfall grill was changed to a broad full-width grill that extended above and below the hood and was also used in the 1946-1948 models (Lincoln sedan and Lincoln Continental). These changes were undoubtedly due to the major Cadillac and Packard grill design changes during these immediate pre-war years, whose production and sales far outpaced Lincoln.

After World War II, production of these vehicles was not resumed. The former Zephyr became the only Lincoln sedan and was available in both standard and DeLuxe versions. The famous Lincoln Continental remained as a limited production, very expensive (and not very reliable) semi-custom offering from the luxury division of Ford Motor Company. For 1949, a major revamp of the entire Lincoln line was made, eliminating the slant-back Zephyr and custom Continental and introducing relatively modern V-8 power.

In 1955, the Lincoln Custom name returned (for one year only) as the lower level series. Brakes were 12" drums.^[5]

A special 1942 limousine was provided to the White House for the President's use. This car weighed more than 7,000 pounds (3,200 kg) and was refitted with a 1946 grill clip after the war for modernization. Cadillac and Lincoln vied for visibility and prestige by supplying limousines and other special vehicles to the White House (generally by means of a $1.00 per year or other low-cost lease arrangement). Packard and Chrysler were rarely able to penetrate this exclusive advertising strategy.