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Chronology of the LA series Chrysler V8 engines

3.9 - 5.2 - 5.9 - 273 - 318 - 340 - 360 - 355

(Thanks to Stephen Havens)

Mid-1964: the first LA engine, the 273, was released as a lightweight, compact V8 for the new Valiant. It needed notches in the side of the block to clear the power steering pump. It had two-barrel carburetor, mechanical cam, forged crank, and 8.8:1 compression.

Engine Years (USA)* Stroke Bore la 318
3.9 1988-2003 3.31 3.91
273 1964-69 3.31 3.63
318 (5.2) 1967-2002 3.31 3.91
340 1968-73 3.31 4.04
3551975?-20013.464.05
360 (5.9) 1971-2002* 3.58 4.00
488 V-10 1991 - 2002 3.88 4.00
505 V-10 2002 - 3.96 4.03
* “They put the 360 in a few of the trucks in early 2003.” — Rovell Rangel

All horsepower ratings before 1970 are gross measurements (without accessories and such). Ratings after 1971 are net measurements and are lower even for the identical engine.

The A engine was produced from 1955 through 1966. The LA, introduced in 1964, had the same basic design but was very heavily modified. The lightweight ("L" A) or thin-wall casting and heads saved around 50 pounds; the wedge-shaped combustion chamber was much smaller than the A engines’ poly heads, greatly reducing the size and allowing the first LA engine (273 V8) to fit into the small Valiant. The LA's valves were simpler too, saving money and size. The 273 ended up being only fifty pounds heavier than the 225-cid slant six.

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