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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.
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 main differences between this version and the sports car version of LS2 is the Vortec intake manifold, the truck water pump and accessory drive configuration and the truck exhaust. —Preceding unsigned comment added by 68.209.128.242 ( talk ) 01:20, 5 January 2009 (UTC) [ reply ]
A long block engine replacement typically requires swapping out parts from the original engine to the long block. These parts can include the oil pan , timing cover , valve covers , intake manifold , emission-control parts, carburetor or fuel injection system, the exhaust manifold(s) , alternator , starter , power steering pump (if any), and ...
It offers the airflow of more expensive heads, at a much lower cost. It does, however, require a specific intake manifold (the L31 has four bolts per head attaching the intake manifold, as opposed to the "traditional" six bolts per head found on older Chevrolet small-blocks). Chevrolet's L31 was replaced by GM's LS-based 5.3L LM7 and 6.0L LQ4.
The firing order of older big-block engines is 1-8-4-3-6-5-7-2 [63] 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.