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The 318 is the most common version of the A engine, produced from 1957 through 1966 in the US and 1967 in some export markets when it was replaced in all markets by the LA 318. Only Plymouth used this 318 in 1957 and 1958, but it was shared with Chrysler from 1959 on and Dodge from 1960 on. [ 5 ]
These engines were based on the Hemi engines, using the same blocks and crankshaft parts, but completely different cylinder heads, pushrods, exhaust manifolds and pistons. They were called Polyspheric or Poly engines, because they featured polyspherical-shaped (meaning "more than one sphere") combustion chambers .
Mopar (a portmanteau of "motor" and "parts") [1] is an American car parts, service, and customer care division of the former Chrysler Corporation, now owned by Netherlands-based automobile manufacturer Stellantis. It serves as a primary OEM accessory seller for Stellantis companies under the Mopar brand.
The 317.5 cu in (5,203 cc) LA 318 has a bore and stroke of 3.906 in × 3.312 in (99.2 mm × 84.1 mm), identical to the A 318 it was derived from. It appeared in volume production beginning with the 1968 model year, replacing the last of the export "A" 318 engines equipped with polyspherical chambered heads ("A" 318 engines were not offered in ...
Plymouth Valiant dealer at 392 Sunrise Highway, Rockville Center, NY. In May 1957, Chrysler president Lester Lum "Tex" Colbert established a committee to develop a competitor in the burgeoning compact car market which included the popular VW Beetle, the new American Motors Rambler and upcoming entries from GM, Ford and Studebaker.
The addition of a two-speed output shaft (overdrive unit) that is bolted to the back of the three-speed transmission has only two ratios: direct (1:1) and overdrive (.69:1). While lubrication to the overdrive unit was a challenge early on, this challenge was later overcome with factory improvements or aftermarket valve body kits.
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