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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.
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.
A hemispherical head ("hemi-head") gives an efficient combustion chamber with minimal heat loss to the head, and allows for two large valves.However, a hemi-head usually allows no more than two valves per cylinder due to the difficulty in arranging the valve gear for four valves at diverging angles, and these large valves are necessarily heavier than those in a multi-valve engine of similar ...
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 ...
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.
The engine was a race-spec 426 Hemi. These motors had a compression ratio of 10.25:1 pistons , bore x stroke 4 + 1 ⁄ 4 in × 3 + 3 ⁄ 4 in (108.0 mm × 95.3 mm) fed through a 2X4-barrel Holley carburetors atop a lightweight crossram aluminum intake manifold rated at 425 hp (431 PS; 317 kW) at 5,000 rpm and a maximum torque of 490 lb⋅ft ...
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