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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 ...
The casting was fixed in mid to late 2001, but the same casting number was retained. The "fixed" heads have "TUPY" cast in the center where the cracks used to occur. [ 37 ] Also new for the 2000 model year, was the distributor-less, coil on plug ignition system. [ 38 ]
The resulting engine was somewhat improved as to power and efficiency. The 5.9 L V8 engines followed suit in 1989, but also received the overall improved "308" cylinder heads (casting number 4448308) that featured significantly higher flowing exhaust ports and a return to the original 1971 (non-fast burn) combustion chamber.
In the case of the Imperial (CG, CH) then Custom imperial (CL, CW), a new and unique straight-8 engine was created with 9 main bearings and equipped with a two-barrel downdraft carburetor. From the CW model, the cylinder head is made of aluminium. It also powered the Dodge Trucks G-80 models (1931-1934) and Fargo buses (1930-1932). [1]
There was a U.S. auto industry-wide shift to lower compression ratios in mid-1971, so AMC increased combustion chamber size to 58-59 cc. The first three digits of the casting number on the large chamber heads are 321, 322, or 323 depending on year. The only difference between small and large chamber Gen-3 heads is the combustion chamber size.
The Chrysler 1.8, 2.0, and 2.4 are inline-4 engines designed originally for the Dodge and Plymouth Neon compact car. These engines were loosely based on their predecessors, the Chrysler 2.2 & 2.5 engine, sharing the same 87.5 mm (3.44 in) bore.
In 1969 the 350 HO was upgraded again with the addition of the 400 HO cam, commonly referred to by enthusiasts as the 068 cam. Also added was the #48 casting number heads with a 68 cc (4.15 cu in) chamber for higher compression, along with larger 2.11 and 1.77 in (54 and 45 mm) valves.
This meant the head was not truly hemispherical, but had more intake port area than exhaust (3.575 in 2 (23.06 cm 2) versus (2.488 in 2 (16.05 cm 2)). [ 1 ] Its intake valves were nearer the intake manifold, exhaust valves nearer the exhaust pipes. [ 1 ]