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The 1972 Chevelle SS top engine was rated at 270 net hp (201 kW), conforming with GM's decree that all engines would be rated at their net engine ratings. All other engines on the SS roster were unchanged from 1971. 1972 was the last year for the cowl induction option for the 454 cid engine and was not even mentioned in the 1972 Chevelle brochure.
1973 Chevrolet Chevelle SS and 1974-1976 Chevelle Laguna S-3 — Offered with a 350 small block or 454 big block V8 with up to 245 hp (183 kW) and mated to manual or automatic transmissions. The SS was replaced for 1974 by the Laguna Type S-3 which offered the same engine/transmission offerings as the '73 SS plus the addition of a 400 small ...
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).
As mentioned above, the Nova option could not officially have V8 engines at this time—the standard SS engine was the six-cylinder (this was also applicable to the Impala (and later the early Chevelle c. 1964–65) when the SS was a sport and appearance package)—but small-block V8 engine swaps were commonplace among enthusiasts.
This engine was superseded by the 409 cu in (6.7 L) as Chevrolet's top performing engine in 1961 and went out of production for cars at the end of that year. It was produced through 1964 for use in large Chevrolet trucks. 1958 348 4-barrel engine. With a four-barrel carburetor, the base Turbo-Thrust produced 250 hp (186 kW).
This engine family was updated in 1968 for the use of 2.45 in (62.2 mm) medium-sized journals. The first engine in this family was the small journal 327 in 1962 and the last being 2000s medium journal 350 in pickup trucks and commercial vehicles. The medium journal 350 was further developed into the Generation II LT1/4 350 in the early 1990s.
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The SS was dropped, but a new Monte Carlo Custom option appeared as a one-year-only offering that included a unique suspension and other items previously included with the SS option. Unlike the departed SS package, it was available with any engine on the roster. The Monte Carlo Custom badging was similar to the Impala Custom.