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" due to their hemispherical shaped combustion chambers. Design Design features of the B and RB engines include 17 capscrews per cylinder head, a cylinder block that extends below the crankshaft centerline, an intake manifold not exposed to crankcase oil on the underside, stamped-steel shaft-mounted rocker arms (race versions used forged steel rockers), and a front-mounted external oil pump driven by the camshaft. The 'B' series wedge engine was introduced in 1958 with and versions. The 361 would continue in production until the end of the series, albeit only for truck installation. The RB ("raised B") arrived one year after the launch of the B series engines, in and displacements. Unlike the previous B-engines, which had a stroke, the RB engines had a stroke. For 1960, a "ram induction" system increased the 413's torque up to on the Chrysler 300F versions. The last 'B-RB' wedge-headed engine was produced in August 1978, ending the era of Chrysler "big-block" engines. B engines All Low Block B-series engines have a stroke, a deck height and connecting rods, resulting in a 1.88:1 rod ratio. 350 The B engine was, along with the 361, the first production B engine, first available in 1958. It had a bore of . The 350 is classified as a big block engine. All parts except for the pistons are fully compatible with the 361. Vehicles using the B 350: 1958 DeSoto Firesweep 1958 Dodge Coronet 1958 Plymouth Fury 361 The 361 cu in B engine also introduced in 1958 was essentially the same as the 350 except with a larger bore, for an actual displacement of . In 1962, the Dodge Polara 500 came standard with a version of the 361 that had a four-barrel carburetor, dual-point distributor, and dual exhausts. Plymouth called their versions of the early B engine the Commando, variants of which included the Golden Commando and Sonoramic Commando. It produced . DeSoto's B engine was named Turboflash and produced . The Dodge standard version was a 2-barrel with called the Super Red