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The Vortec 5700 L31 (VIN code "R") is a 5.7L V8 truck engine. It is Chevrolet's last production first-generation small-block. The cylinder heads feature combustion chambers and intake ports very similar to those of the LT1 V8, but lacking the LT1's reverse-flow cooling and higher compression.
For the Vortec 4300, see Chevrolet 90° V6 engine. V8 For the Vortec 4800, see General Motors small-block engine. For the Vortec 5000, see Chevrolet small-block engine (first- and second-generation). For the Vortec 5300, see General Motors small-block engine. For the Vortec 5700, see Chevrolet small-block engine (first- and second-generation).
These heads are referred to as Vortec heads. The engine block was revised with structural reinforcing ribs up front eliminating the two freeze plugs (on the front and back) along with an alloy oil pan (for the S-10, Blazer, and Jimmy). The 1996+ cast aluminum oil pan has 12 bolts where a 16-bolt oil pan from the earlier 4.3 does not interchange.
The Chevrolet small-block engine refers to one of the several gasoline-powered vehicle engines manufactured by General Motors. These include: The first or second generation of non-LS Chevrolet small-block engines; The third, fourth, or fifth generation of LS-based GM engines; The Chevrolet Gemini small-block engine
The Vortec 4800 LY2 (VIN code "C") is a Generation IV small-block V8 truck engine. Like its LR4 predecessor, it gets its displacement from a bore and stroke of 96 mm × 83 mm (3.78 in × 3.27 in). Like its LR4 predecessor, it gets its displacement from a bore and stroke of 96 mm × 83 mm (3.78 in × 3.27 in).
1977–2013 Chevrolet 90° V6 engine (derived from the Chevrolet Small-Block" V8; now marketed as GM Vortec V6 or Vortec 4300 or EcoTec3 V6) 1979–2010 Chevrolet 60-Degree V6; 1994–2005 Opel 54-Degree L81 V6 (used in the Saturn Vue, Cadillac Catera and Saturn L series) 1995–present Suzuki H (used in several models built for GM by Suzuki)