[1] Pontiac was the first of General Motors companion make program where brands were introduced to fill in pricing gaps that had developed between Cadillac, Buick, Oldsmobile, Oakland and Chevrolet.

Pontiac was introduced as an affordable Oakland, followed by LaSalle for Cadillac, Marquette for Buick and Viking for Oldsmobile.

[1] The 1926 Pontiac 6 was first introduced as the Series 6-27 using Fisher Body coachwork, and only offered a 2-door 2-passenger Coupe or 5-passenger Coach with a list price of US$825[1] ($14,199 in 2023 dollars [2]).

[1] January 1929, the updated Series 6-29 "New Big 6" was introduced, signifying that the engine displacement was now at 200 ci, and styling was now influenced by the Vauxhall 20-60 which GM had previously purchased in 1925.

Some of the improvements recorded were appearance, mechanical or feature enhancements to include a vertical center divider on the surface of the radiator, vertical louvers on the sides of the engine cover, oval opera windows on closed body sedans, and a combination transmission and ignition lock.

The Series 402 Six offered the same appearance, mechanical and optional equipment installed on all GM vehicles that year, a 114" wheelbase, including the availability of a radio, relocating the sun visor to inside the vehicle, replacing the vertical engine compartment vents with individual doors, fender lights on deepened crown front fenders, and sharing the curved front bar between the headlights used on the 1932 Chevrolet.

As all GM vehicles shared a common appearance due to coachwork was provided by Fisher Body vehicles, a streamlined appearance with a narrow grille covering a concealed radiator with a chrome waterfall grille extending along the center and top of the engine cover was added, which showed a resemblance to the LaSalle and the Cadillac Series 60.