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The 1964 Belvedere was also the car used to introduce the 426 Chrysler Hemi engine, which used a canted large-valve arrangement. This was such a significant high-RPM breathing improvement that Hemi-equipped Plymouth Belvederes won first, second, and third at NASCAR's 1964 Daytona race. One of the winning drivers was Richard Petty. [19]
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.
Engine choices were 440 four-barrel, 440 with three two-barrels (Six Pack), and 426 Hemi. Emission restrictions such as lower compression ratios and faster-acting choke operation lowered the base 440 output by 5 hp (3.7 kW), to 370 hp (280 kW). The 440 Six Pack was down to 385 hp (287 kW), but the Hemi was still rated at 425 hp (317 kW).
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 ...
Tom Hoover was the leading engineer of the Chrysler 426 Hemi engine.. Tom Hoover's development of the first trademarked Hemi engine through Chrysler Corporation was a major success for the brand through the mid to late 1960s and early 1970s.
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.