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The DeSoto and Dodge 270/315/325 poly used similar head architecture but was not related to the Plymouth A Engine, using its own heads and the same bottom end as the Dodge and Desoto Red Ram Hemi. The A engine cylinder bore center distance is 4.46 in (113.3 mm), larger than the earlier Dodge-based poly engines.
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.
The 325 was basically a detuned polyspherical combustion chambered version of the Dodge "Red Ram" 325 Hemi. With the optional power-pack four-barrel V8, the 1957 Firesweep produced 260 hp at 4400 rpm. This represented an increase of fifteen horsepower over the two-barrel engine. [5]
The first engine called "Hemi" by Chrysler, [b] the 426 was nicknamed the "elephant engine" at the time, a reference to its high power, heavy weight, and large physical dimensions. [17] Its 10.72 in (272.3 mm) deck height and 4.80 in (121.9 mm) bore spacing made it the biggest engine in racing at the time.
2003–present: Hemi. 5.7L Hemi - The smallest modern Hemi engine, called the Eagle, introduced in 2002. 6.1L Hemi - A larger modern Hemi, 2004–2010. 6.4L Hemi - A larger bore modern Hemi engine, called the Apache, introduced in 2011. 6.2L Hemi - A supercharged Hemi engine, called the Hellcat, introduced in 2014.
The DeSoto Firesweep polyhead V8s were introduced with a bore and stroke of 3.6875 in (94 mm) X 3.800 in (97 mm). for 325 cid. The two barrel V8 was rated at 240 hp (179 kW) while the four barrel version produced 260 hp (194 kW). The 330 cid hemi engine was replaced by a hemi which was 341 cid (5.6L) . The two barrel carburetor produced 270 hp ...
The Firedome was powered by a Hemi V8 engine producing 160 hp (120 kW) and had a top speed of 100 mph (160 km/h). The car weighed 3,700 lb (1,700 kg) and had a 0–60 mph (100 km/h) time of 15.5 seconds. This was the first time that DeSoto offered an 8-cylinder engine in one of its models since 1931.
In this way, the "Hemi" moniker was used for the same kind of marketing cachet as Chrysler's 1950s-1970s Hemi V8 engines. The Hemi-6 valves are angled apart (splayed) 18 degrees (included angle) along the crankshaft axis, and the intake valves are as large as 1.96 in (50 mm). The 6 intake and 6 exhaust valves open slightly towards each other ...
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