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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 .
The L72 was a 427 cu in (7.0 L) 90° overhead valve V8 big-block engine produced by Chevrolet between 1966 and 1969. Initially rated at 450 horsepower, the rating dropped to 425 hp (317 kW) shortly after its release (although there was no change in power).
It has a 7.0 L version of the small block engine codenamed LS7. At 427.6 cubic inches, the Z06 was the largest small block ever offered by General Motors. Because of the Corvette's former use of 427 cubic-inch big blocks in the late-1960s and early 1970s, the LS7's size was rounded down to 427 cubic inches.
The C3 fifteen-year run shows an extreme contrast. The list price for the Corvette in 1968 was $4,663 (~$42,163 in 2024). By 1982 the base price had increased to $18,290 (~$48,871 in 2023). In 1968 there were six engines, two small-block V8s and four big-block V8s. By 1982 there was only one small block V8 engine available.
However, the C4's performance was hampered by its L98 250 hp (186 kW) engine until 1992, [7] when the second-generation Chevy small block, the 300 hp (224 kW) LT1, was introduced, markedly improving the C4's performance. 1996 was a high point of small block engines development and the 330 hp (246 kW) LT4 was introduced in all six-speed manual ...
The block entered production in mid 1965 as the Mark IV 396 cu in (6.5 L) "Turbo-Jet," phasing out the first-generation W-series Big-Block. In its first year the 396 was available as the L78 option in Corvettes and full-sized ( Impala , Bel Air , Biscayne ) models, and as the L37 in the intermediate ( Chevelle ) model.
The 1965 Corvette Sting Ray became ferocious with the mid-year debut of the "Big-Block" 396 cu in (6,490 cc) engine producing 425 hp (317 kW). Ultimately, this spelled the end for the Rochester fuel injection system, as the carbureted 396ci/425hp option cost $292.70 to the fuel injected 327ci/375hp's $538.00.
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