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It is an all-iron engine (block and heads) with two valves per cylinder. It retained the 4.25 in (107.95 mm) bore diameter of the old 7.0 L (427 cu in) and 7.4 L (454 cu in) big-blocks, but the stroke was increased to 4.37 in (111.00 mm) for a total displacement of 495.95 cu in (8.1 L).
Engine family Production Code (RPO) Output (SAE Net) Notes Power ... 454 SS, 1990 Chevrolet big-block V8 1991–1995 over 8,500 lbs GVWR 1991–1993
Chevrolet big-block V8s; Chevrolet small-block V8s; GM Vortec 4300 90° V6; GM Iron Duke RWD inline 4 (early RWD Variants, later versions may use a FWD pattern, and have two possible starter locations) Jeep with GM Iron Duke inline 4 2.5L/151 in³ (1980-1983).
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
The 7.0 L (6,967 cc; 425.2 cu in) big-block was the first tall-deck "big block," produced from 1965 through 1967. It is arguably the best engine Olds made in the muscle car era, although it never made it into a "muscle car". It used a 4.126 in (104.8 mm) bore and 3.975 in (101.0 mm) stroke.
The Buick V8 family can be divided into two sizes, big-blocks and small-blocks (block size classification refers to the engine block's bore spacing and external dimensions, not displacement). All 1953–1966 Buick V8s and the 1967–1976 "big-block" engines shared a 4.75 in (121 mm) bore spacing. The small-block was produced from 1961 to 1981.
The Suburban shared several engines with the C/K pickup truck line. A 250-cubic-inch inline-six was the standard engine through 1979. The model line was offered with a 307- (1973 only) and 350-cubic-inch small-block V8s; a 454-cubic-inch big-block V8 was optional in C-series Suburbans.
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).
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