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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.
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.
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 Hemi 5.7L engine was dropped (except only Mexico-market Ram 4000), and the Hemi 6.4L becomes the base engine. For 2500 and 3500 pickups with the 6.4L, a ZF 8HP75-LCV 8-speed automatic is mated. The 6.7-liter Cummins turbo-diesel returns in both Standard and High-Output form, but with a new compacted graphite iron (CGI) block.
A 1964 Rambler American with a 195.6 OHV engine. American Motors' first straight-six engine was the 196 cubic inch (195.6 cu in (3.2 L)) six produced from 1952 through 1965, initially as a flathead (L-head) side-valve, and later an overhead valve (OHV) version.
The camshaft was the HO cam with 288/301 duration. It was the top-of-the-line engine unless one opted for the "Ram Air" V-8 derived from it. As Pontiac's 1967 performance brochure said, "You can add the Ram Air induction hood scoop and new high output cam and valve springs to the Quadra-Power 400 for better top end breathing."
The 4.7-liter version was the first of this family, appearing in the 1999 Jeep Grand Cherokee.The displacement is 4.7 L; 286.7 cu in (4,698 cc) with a bore and a stroke of 3.66 in × 3.405 in (93.0 mm × 86.5 mm).
An SRT version was unveiled at the 2011 New York International Auto Show, featuring the 6.4 L 392 Hemi V8 engine. The 6.4 L 392 Hemi engine is also used in other Chrysler Group SRT vehicles such as the Dodge Charger and Challenger. With 470 hp (350 kW), the new 300 SRT can go from 0 to 60 mph (97 km/h) in the low 4-second range. [49]