Chrysler actually made three basic versions of the 318: the first, polyspherical-head version in the 1960s - the second, LA family in the late 1960s and through to the late 1980s/early 1990s - and the final Magnum family, which is still in production for light trucks and Jeeps.
The 318 came as the standard V-8 for many years, and was the optional V-8 on Valiants and other small cars in its earlier years, when the 273 was still around.
The cylinder bore is 4.00" (compared with 3.91" for the 318), and the stroke is 3.58" (compared with 3.31" for the 318).
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