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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.
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 dropped to 375 hp (280 kW) in subsequent years (although there was no change in power).
The big-block engines initially used a forged crankshaft with a stroke of 3.975" for the 1965-1967 425 and 400 CID versions; starting in 1968, both the 400 cu in (6.6 L) and the 455 cu in (7.5 L) big blocks used a stroke of 4.25 in (108 mm), with crankshaft material changed to cast iron except in a few rare cases.
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 ...
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.
U.S. President-elect Donald Trump is making good on his threats to go after the media in court, with several recent lawsuits seeking damages against major publishers over what he describes as ...