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The A and LA engine families were modern, relatively efficient, and extremely durable designs that became the mainstay of Chrysler's cars and trucks for decades - a fact which would probably have surprised their designers, given the pace of engine development at the time. A dizzying variety of engine variations were being produced in the 1950s and 1960s, steadying out in time so that the 318 and 360 cubic inch sizes remained for over thirty years each. The basic design is still in use, in the 505 cubic inch Viper V-10, though the V8 and V6 varieties have finally been replaced (the 318, by the 4.7; the 360, by the Hemi; and the 3.9 V6, by the 3.7 V6). There also remains a racing-only LA-based four cylinder
The LA blocks are different in deck height, but share some internal components with the LA block. The cylinder heads and intake are different. The LA engines look the same on the outside as each other, though not the same as the A blocks.
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