[1] Initially used by Chrysler, the straight-four was fitted to Plymouth cars and Dodge light trucks beginning in 1929, lasting in production through 1933.

After the introduction of the Plymouth brand in 1929, the base engine was subjected to a major redesign and enlarged to 175.4 cu in (2,874.3 cc) with the power rating remaining the same.

A small-bore version was developed for export markets in 1931, with a narrower bore which brought the RAC rating down from 21 to 15.6 hp.

[1] So, with the introduction of the new Desoto brand in 1929, came a new and cheaper to produce six cylinder, the K-Model, with four main bearings and deep skirts.

In 1932, the Ford flathead V8's launch shook up the market, expanding the demand for larger engines to even entry-level brands.

Thanks to judicious bore and stroke dimensioning, the Canadian 201- and 218-cubic inch engines had nearly identical displacement to their American cousins.

[4] During World War II, the 251 cu in (4,107 cc) flathead six was used as the basis for the Chrysler A57 multibank tank engine.

It was replaced throughout Chrysler products by the much more efficient OHV Slant-6 released in 1960, which appeared in most Dodge trucks starting in 1961.