Mopar LA Series V8 Engines: 318, 340, 360, and 273 The 360 Willem Weertman wrote that Chrysler wanted a low-cost engine between the 318 and 383 (like the B-series 361); the result was the 360, which debuted in early 1971 It had a cast crank and external balancing, and was the only LA engine without a 3 31" stroke, going up to 3 58"