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In a hemispherical cylinder head, when air enters the combustion chamber through the intake valve, it flows to the exhaust valve instead of being forced through the exhaust valve as pressure is built up in the combustion chamber. While Tom Hoover developed the 426 Hemi engine, cylinder heads can be interchanged between specific engines.
The Chrysler B and RB engines are a series of big-block V8 gasoline engines introduced in 1958 to replace the Chrysler FirePower (first generation Hemi) engines. The B and RB engines are often referred to as "wedge" engines because they use wedge-shaped combustion chambers; this differentiates them from Chrysler's 426 Hemi big block engines that are typically referred to as "Hemi" or "426 Hemi ...
Intended to deal with the troubles created by the low-production 426, of which only about 9,000 were built from 1966 to 1972), [4] as well as the different architectures of the higher-volume 383 cu in (6.3 L) and 400 cu in (6.6 L) B and 440 cu in (7.2 L) RB V8s, the ball-stud hemi was to be suitable for high-volume manufacture at low cost while ...
The standard engine was the 440 Magnum, but factory literature described the 426 Hemi as standard. The Charger 500 had the Torqueflite standard and the same equipment standard as the R/T. A total of 392 Charger 500s were made, of which only 67 had the 426 Hemi engine, 27 with a 4-speed, and 40 with an automatic transmission.
Chrysler developed its first experimental hemi engine for the Republic P-47 Thunderbolt fighter aircraft. The XIV-2220 was an inverted V16 rated at 2,500 hp (1,860 kW). The P-47 was already in production with a Pratt & Whitney radial engine when the XIV-2220 flew successfully in trials in 1945 as a possible upgrade, but the war was winding down and it did not go into production.
The Hemi-6 is a pushrod O.H.V. (overhead valve engine), with combustion chambers comprising about 35% of the top of the globe. This creates what is known as a low hemispherical shaped chamber. In this way, the "Hemi" moniker was used for the same kind of marketing cachet as Chrysler's 1950s-1970s Hemi V8 engines.
A “six-pack” (three two-barrel carburetors) version of the 440 engine was added to the list mid-year. This engine was between the standard engine and the Hemi as a $463 option. The 1969 model year included the base 383 hp (high performance) with the 440 six-pack and 426 Hemi optional. The 440 Magnum (4-bbl) was not available in the Coronet R/T.
Beginning in 1951, Chrysler's primary V8 engine was its 331 c.i. Hemi. In 1958, Chrysler introduced its new wedge-head B Block engine, which was implemented in the Dodge and DeSoto lines. The following year saw the introduction of the RB Block in Chryslers and Imperials ; this was a modified B Block with a raised deck resulting in an increase ...