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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 ]
The Polyspheric or Poly engines were V8 engines produced by Chrysler from 1955 to 1958 as lower-cost alternatives to the Hemi engines. [1] 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.
In the mid-1960s, Chrysler decided to adapt the 318 cu in (5.2 L) small block V8 into a lightweight, high output engine equally suited for drag strip or street performance use. Its block was bored out to 4.04 in (102.6 mm) but its 3.31 in (84.1 mm) stroke left unchanged, resulting in the 340 cu in (5.6 L) engine introduced for the 1968 model year.
It is not the same as Chrysler's 360 V8. [4] Chrysler continued production of the AMC 360 engine after the 1987 buyout of AMC to power the full-size Jeep Wagoneer (SJ) SUV that was produced until 1991. [5] It was one of the last carbureted car/truck engines built in North America. [6] Chrysler never used this engine in any other vehicle.
The 440 was rated at 375 bhp (280 kW) with a single 4-barrel carburetor. The 318 two-barrel "LA" Chrysler LA engine was now standard, but with wedge-shaped combustion chambers, unlike the previous 1966 polyspherical (or "poly") design, rated at 230 bhp (170 kW). The 383 4-barrel was rated at 325 bhp (242 kW) and the 426 Street Hemi at 425 bhp ...
The Coronet R/T was available as a two-door hardtop or convertible. The standard engine was Chrysler's largest, the 440 cu in (7.2 L) V8 producing 375 bhp and dubbed the Magnum. The only engine option was the 426-cid Hemi, now in its second year in "Street" trim and again rated at 425 bhp. It was a $908 option.
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