Polyspheric

Dodge and Plymouth both offered Poly versions of Dodge's Hemi engine. The Dodge versions were marketed as Red Ram or Super Red Ram (internal code A388). 241 The 241 displaced and was Plymouth's Poly version of the Dodge's 241 Hemi for 1955. Bore and stroke were the same as for the Dodge engine, at by , respectively (). Maximum power claimed was . 260 The 260, also known as the 259, displaced and was introduced in the middle of 1955 by Plymouth. It was a bored-out 241, having a bore and keeping the stroke (). This engine was also used on 1955 and 1956 Dodge trucks. Maximum power claimed was with a two-barrel carburetor; a four-barrel version with was added later. 270 The 270 displaced and was offered in both Plymouths (1956) and Dodges (1955–1956). Like its predecessors, it was a Poly version of Dodge's 270 Hemi. Bore and stroke were the same as the Hemi's at by , respectively (). Outputs are depending on fitment. 315 The 315 displaced and was a Poly version of Dodge's high-deck 315 Hemi. Bore and stroke were the same at by , respectively. Only used on 1956 Dodges. 325 The 325 displaced and was a Poly version of Dodge's largest high-deck 325 Hemi. Bore and stroke were the same at by , respectively. Used on 1957 and 1958 Dodge. == Chrysler ==

The Spitfire engines were Poly variants of Chrysler's FirePower (Hemi) engine. Chrysler built three Spitfire engines: the 331 Poly, 354 Poly, and the all-new 301 Poly, which did not have a Hemi version. They were introduced for 1955 in the low-priced Chrysler Saratoga and Windsor models and used through 1958. All Chrysler Spitfire engines were low deck; no Poly version of the raised deck 392 Hemi engine was produced. 301 The 301 displaced and was Chrysler's smallest Poly engine. The 301 has a bore and a stroke. 331 The 331 displaced and was a Poly version of Chrysler's 331 Hemi. Bore and stroke were the same at by , respectively (). 354 The 354 displaced and was a Poly version of Chrysler's 354 Hemi. Bore and stroke were the same at by , respectively (). The 1958 Chrysler Saratoga with four-barrel carberutor (58S) was the most powerful at . == References ==