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The engine was available through mid-1965, when it was replaced by the 396 cu in (6.5 L) 375 hp (280 kW) Mark IV big-block engine. In addition, a 340 hp (254 kW) version of the 409 engine was available from 1963 to 1965, with a single 4-barrel cast iron intake mounting a Rochester 4GC square-bore carburetor, and hydraulic lifters.
In 1964, horsepower increased to 365 hp (272 kW) for the newly named L-76 version, and 375 hp (280 kW) for the fuel injected L-84, making the L-84 the most powerful naturally aspirated, single-cam, production small-block V8 until the appearance of the 385 hp (287 kW), 395 lb⋅ft (536 N⋅m) Generation III LS6 in 2001. This block is one of ...
The newest American high-performance pickup truck since the 1989 Shelby Dakota, the 454 SS was a 1 ⁄ 2-ton C1500 powered by a 230 hp (172 kW) 7.4 L V8. Deriving much of its design from the Sport Equipment Package, the 454 SS was distinguished by a nearly monochromatic black exterior, gloss-black grille (with red-trim badging), and body-color ...
Optional engines included a 275-horsepower 327-cubic-inch Turbo Fire V-8, the 396-cubic-inch Turbo-Jet V-8 rated at 325 horsepower, or two new 427-cubic-inch Turbo Jet V8s of 390 horsepower with 10.5 to 1 compression ratio and hydraulic lifters or the high performance version rated at 425 horsepower with 11 to 1 compression ratio and solid lifters.
Power and performance were reduced. Engine offerings for 1971 included the 250-6, small-block V8s of 307 and 350 cubic inches; and big block V8s of 402 and 454-cubic-inch displacements. Horsepower ratings of those engines for 1971 ranged from 145 for the six to 365 for the RPO LS5 454 – all in gross figures. The LS6 454 V8 was gone forever.
The 454 engine option was available for the first half of the model year in the Chevelle and thus the 1975 Laguna had the 400 as the top engine. The 49-states' engine line-up was - the standard 145-horsepower 350 two-barrel V8, the optional 175-horsepower 400 four-barrel V8, and the 215-horsepower 454 four-barrel V8.
Between 1966 and 1969 the L78 was the highest-horsepower engine available in Chevrolet's intermediate line via a Regular Production Option (RPO). Despite this, in 1969 an L72 427 cu in (7.0 L), 425 hp (317 kW) engine could be ordered in an intermediate via a Central Office Production Order (COPO).
Although the engine is an outgrowth of the Gen-2 V8, these changes cause it to be regarded as the third generation of AMC V8, or "Gen-3". The stroke and deck height on the 290 and 343 were increased by 0.16 in (4.06 mm) on both engines, becoming the 304 cu in (5.0 L) and 360 cu in (5.9 L), respectively.