Although aesthetically pleasing, the DeSoto’s deep chamber (where the depth is a large percentage of the radius, although less than 100%) has proven not to be the most efficient shape, and later motors (such as the “RB” based 426 hemi) used a lower percentage of a hemisphere of larger diameter.

DeSoto hemi motor bore and stroke data, with deck heights, rod dimensions, crankshaft specifications, rocker arm and stand data

DeSoto hemi motor bore and stroke data, with deck heights, rod dimensions, crankshaft specifications, rocker arm and stand data

DeSoto hemi motor bore and stroke data, with deck heights, rod dimensions, crankshaft specifications, rocker arm and stand data

DeSoto hemi motor bore and stroke data, with deck heights, rod dimensions, crankshaft specifications, rocker arm and stand data

DeSoto developed and introduced their own unique hemi motor in 1952, the Type II. These motors were sized in between the Chrysler and Dodge hemis. In 1964, Chrysler introduced yet another hemi motor (the largest: Generation 2) developed from the “RB” and unrelated except in general theory to the earlier types.

After the original introduction (limited to Chrysler cars only), DeSoto and Dodge developed and introduced their own unique hemi motors in 1952 (Type II) and 1953 (Type III), respectively.

1955-58 Chrysler Saratoga and Windsor 301, 331 & 354 poly motors can be converted to hemi by substitution of hemi parts using Chrysler parts only. If the original pistons are used, the motor will run, but have lower compression since the poly piston does not have a compression dome.

1953-57 Dodge hemi motor bore and stroke data, with deck heights, rod dimensions, crankshaft specifications, rocker arm and stand data

1952-57 DeSoto Hemi: Sources & Suppliers The following tables contains manufacturers and dealers who offer parts and services for hemi motors. Inclusion in this list is not a recommendation.