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General Motors has produced three different engines called LT1: 1970–1972 LT-1 – Chevrolet Generation I Small-Block; 1992–1997 LT1 – GM Generation II Small-Block; 2013–(current) LT1 - GM Generation V Small-Block.
Being nearly identical, it too has the distinctive odd-sided hexagonal shape. These engines can be fitted in rear wheel drive vehicles with the right bellhousing and are used in hot rods, kit cars, sand rails and late model engine swaps. All Cadillac Northstar V8s; Oldsmobile Aurora L47 V8; GM 3.5L LX5 "Short Star" V6
The Beare-head engine internal combustion engine technology combines a four-stroke engine bottom end and piston, with a ported cylinder head closely resembling that of a two-stroke engine. The head piston is smaller and moves at half cycling of the bottom piston.
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.
Both engines were replaced by a 7.4L V8 for 1999, which was replaced by a 8.1L Vortec V8 for 2001 (the largest-displacement V8 ever offered in a mass-produced Chevrolet). Coinciding with the retirement of the Caterpillar 3208 V8 and the Detroit Diesel 8.2L V8 diesel engines, the GMT530 introduced a 6.6L Caterpillar 3116 inline-6 turbodiesel ...
The transverse use of GM's LS small-block engine in the W-bodies was a major addition for 2005. The GM W Platform was phased out with the production of the new long-wheelbase Epsilon II platform . The last car produced on the W platform was the ninth generation of the Chevrolet Impala , which was replaced by the Epsilon-based tenth-generation ...
All engines in this family share the same block dimensions and sometimes even the same casting number; the latter meaning engines were of the same block, but with different strokes (e.g., the casting number 3970010 was used by all three engines: 302, 327, and 350). This engine family was updated in 1968 for the use of 2.45 in (62.2 mm) medium ...
The 7.0L V8 was discontinued, leaving the 6.0L V8 as the sole gasoline engine. As part of the 1997 GMT530 revision, the 6.0L V8 was replaced by the Vortec 7.4L V8; in 2001, an all-new 8.1L V8 (one of the largest gasoline engines ever used in a school bus) became the gasoline engine.