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There was a U.S. auto industry-wide shift to lower compression ratios in mid-1971, so AMC increased combustion chamber size to 58-59 cc. The first three digits of the casting number on the large chamber heads are 321, 322, or 323 depending on year. The only difference between small and large chamber Gen-3 heads is the combustion chamber size.
The 305 also became the standard V8 in GM's C/K truck series, and was even used in the Corvette for California in 1980. Crankshafts used with the 305 had the same casting number as the 350 with one discernible difference—the 305 crank is lighter in weight to compensate for engine balancing.
This was so named because it began with Chevrolet's V8 engines. 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)
All Packard V8 powered AMCs came with Packard's Ultramatic automatic transmission. Late in 1956, AMC introduced its own V8 design in a 250 cu in (4.1 L) version and used it only in the Ambassador and Hornet Special models. The Specials were actually the slightly smaller and lighter Statesman/Wasp two-door hardtop bodies with Ambassador/Hornet trim.
V8 Series (1358in 3; diesel) V12 cylinder. V12 Series (2035in 3; diesel) See also. Allis-Chalmers; Gleaner-- A-C's line of combine harvesters, purchased in 1955;
302 Windsor V8; 351 Windsor V8; 400 Cleveland Ford 335 engine#400 V8 aka 400FMX certain 1973 casting numbers D1AE and D3AE, mated to the FMX transmission) 3.8/3.9/4.2L Canadian Essex 90° V6 (RWD only) 240 I6; 300 4.9 I6; 4.6L Modular V8 (first two casting runs, numbers F1AE and F2VE) 302 5.0L Windsor V8; 351 5.8L Windsor V8
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 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).