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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 a hydraulic-lifter camshaft.
396–402 cu in (6.5–6.6 L) ... The L78 was a Big-Block engine produced by Chevrolet between 1965 and 1970. Rated at 425 hp (317 kW) for its first year, the rating ...
Chevrolet small-block engine: 1967-1968 220 hp @ 4400 RPM 320 lb-ft @ 2800 RPM 350 cu in (5.7 L) V8 Chevrolet small-block engine: 1969-1972 4-bbl 250 hp @ 4600 RPM 350 lb-ft @ 3000 RPM RPO code LS9 351 cu in (5.8 L) V6 GMC V6 engine: 1967-1969 1-bbl 351E 396 cu in (6.5 L) V8 Chevrolet big-block engine (Mark IV) 1968-1970 4-bbl 325 hp @ 4800 RPM ...
This move reduced horsepower ratings on the big-block engines to 300 for the 402 cubic-inch V8, but the LS5 454 option had an "advertised" five-horsepower increase to 365. Both 350 V8 engines and the dual exhaust 402 cid V8 engine were available without the SS option; only the LS5 454 V8 required the SS option.
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.
2023 Mercedes-AMG C 43 luxury sport sedan revealed with a 402-horsepower four-cylinder and technology from Mercedes F1 cars.