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Vortec is a trademarked name for a line of gasoline engines for General Motors trucks. The name first appeared in an advertisement for the 1985 model year 4.3 L V6 that used "vortex technology" to create a vortex inside the combustion chamber , creating a better air / fuel atomization. [ 1 ]
The LB1 used in trucks and vans was referred to as Vortec in Chevrolet literature (named after a combustion chamber design known as a swirl port which twists the fuel mix from the intake ports as introduced with the Cavalier's 2.0L engine), and this name continued to be used with all truck and van 4.3 L (262 cu in) V6s until 2014.
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.
The Vortec 5300 L33 (VIN code "B") is an aluminum block version of the LM7, marketed as the Vortec 5300 HO. Instead of the LM7's dished pistons, the L33 uses the 4.8L's flat top pistons. It also uses 799 cylinder heads, identical to 243 castings found on LS6s and LS2s, lacking only LS6-spec valve springs and lightweight valves.
Starting around 1925 engine blocks and cylinder heads were now developed at each brand but were cast at Saginaw Metal Casting Operations. [3] In the mid-1960s, there were 8 separate families of GM V8 engines on sale in the USA. [4] [1] By the 1970s, GM began to see problems with their approach.
Chevrolet 153 Inline 4 (Chevy II, pre-Iron-Duke - includes the Vortec 3000/181 industrial/marine crate motor) Detroit Diesel V8 6.2L and 6.5L; Duramax V8; Generation III V8s with modifications. These modifications include an additional bolt hole at the top of the pattern, and attachment points for cast oil pans to lower bellhousing extensions ...
The firing order of older big-block engines is 1-8-4-3-6-5-7-2 [62] while Vortec 8100's firing order is 1-8-7-2-6-5-4-3. Other upgrades of Vortec 8100 include a new 18-bolt head bolt pattern, longer connecting rods, different symmetrical intake ports, different oil pan rails, and the use of metric threads throughout the engine.
The LLV (also called Vortec 2900) is a 2.9 L; 178.3 cu in (2,921 cc) straight-4 DOHC engine produced between 2007 and 2012, with a 95.5 mm × 102 mm (3.76 in × 4.02 in) bore and a stroke. It replaced the LK5 and produced 185 hp (138 kW) at 5,600 rpm and 190 lb⋅ft (258 N⋅m) of torque at 2,800 rpm.
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