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Initially introduced as the Dodge Red Ram Hemi, this Hemi was a six-cylinder in 1953, but  a Hemi V8, based on the 1951 Chrysler Hemi, followed in short order, but it had a smaller displacement for the lighter weight Dodge family. None of the major components were interchangeable with any other Chryco subsidiary product. This early version had a bore center of 4.1875 inches (106.4mm), which was the smallest Hemi made.

The Dodge division offered a lower powered, less technical polyspheric (poly) head designed from ’55 to ’58, which used a single rocker shaft configuration in the heads. This design also appeared in the DeSoto and the top-line Plymouth models for the ’55 and ’56 model years.

DeSoto 1955© Kmm7553 | Dreamstime.com Classic 1955 DeSoto 

Dodge Royal Lancer 1955

© Shootalot | Dreamstime.com Dodge Royal Lancer

Also marketed by Dodge in ’53 was a lower compression (ratio=7.1:1), 24-cubic-inch Hemi with a bore of 3.4375 inches and a stroke 3.25 inches long, which produced 140 bhp (104 k/w). This wasn’t the same engine as the Plymouth 241, which used the hybrid poly head design.

Marketed as the Dodge 270 for the ’55 and ’56 model years, the 268-cubic-inch (4.4L) inline engine was available on the high-end models, including the Dodge Meadowbrook and with its 7.5:1 compression ratio developed 150 bhp (112 kw). This power plant is different from the Plymouth and the Dodge Coronet 270, which had a lower compression (7.1:1) poly head engine producing 140 bhp (104 kw).

In 1956, Dodge offered a larger 315-cubic-inch (5.2L) power plant that had a longer 3.80-inch ( 96.5mm) stroke and used a raised deck block with the polyspherical heads. There was an optional D-500 version of this engine with a four-barrel carburetor and larger valves; this unit was a Hemispherical design. The Dash 1 or D-500-1 had an aluminum intake manifold with a pair of Carter WCFB carburetors mounted on top and was available as a “racing only” package although this head was identical in size and shape to the base 500-1 models. The carburetor was the same as the one used for the base Chrysler 300B and the DeSoto Adventurer.

dodge57© Steirus | Dreamstime.com Dodge Coronet 1957

For the 1957 model year, Dodge developed a 325-cubic-inch engine, and the base offering was a poly head called the KDS, which had a 3.6875-inch (93.7mm) bore with a 3.80-inch (96.5mm) stroke. The higher performance 325,  the KD-500, was a Hemi design. There was also a rare extra high-performance KD-500-1 version, which sported two four-barrel carburetors. These engines all have mechanical valves, but the Hemi version had the dimples in the valve covers to accommodate the clearances for the adjusters on the mechanical valves.

The post Chrysler Hemi Power 3 of 5 appeared first on Muscle Car Fan.

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