Editing General Motors Atlas engine (section)

== LL8 (Vortec 4200) ==
[[File:2006 LL8 (Vortec 4200) engine in 2006 Chevrolet Trailblazer.jpg|thumb|left|2006 LL8 (Vortec 4200) engine in 2006 Chevrolet TrailBlazer]]
The '''LL8''' (or '''Vortec 4200'''), is a [[straight-6]] gasoline engine produced from 2002 to 2009. It was the first Atlas engine, and was introduced in 2002 for the [[Chevrolet TrailBlazer]], [[GMC Envoy]], and [[Oldsmobile Bravada]]. The engine was also used in the [[Buick Rainier]], [[Saab 9-7X]], and [[Isuzu Ascender]].

It displaces {{cvt|4.16|L|cc cuin|adj=ri1|sigfig=4}}, with a {{cvt|93x102|mm|in|2}} bore and stroke. It has four valves per cylinder, utilizes dual-overhead cams ([[DOHC]]) design, and features [[variable valve timing]] on the exhaust cam, a first for GM inline engines. When introduced, this engine's power was {{cvt|270|hp|kW|0}} at 6,000 [[revolutions per minute|rpm]] and torque was {{cvt|275|lbft|Nm|0}} at 3,600&nbsp;rpm. 2003 saw a slight bump in power to {{cvt|275|hp|0}}, while torque was unchanged. For 2006, power was increased to {{cvt|291|hp|kW|0}} at 6,000&nbsp;rpm and torque to {{cvt|277|lbft|Nm|0}}) at 4800&nbsp;rpm with the addition of a [[Mass flow sensor#Hot wire sensor (MAF)|MAF]] and a complete internal redesign of the engine; however, due to the new [[SAE viscosity number|SAE]] rating procedures, ratings can vary slightly between years. The engine redline is 6,300&nbsp;rpm. The '''LL8''' was on the [[Ward's 10 Best Engines]] list for 2002 through 2005 and was the basis for all the other '''Atlas''' engines. With the closure of the [[Moraine, Ohio]], plant and the discontinuation of the [[GMT360]] platform (Chevrolet TrailBlazer, GMC Envoy, etc.), production of the '''LL8''' also ended.<ref name="2007_LL8">{{XLSlink|[https://web.archive.org/web/20111027073341/http://archives.media.gm.com/us/powertrain/en/product_services/2007/Spec%20Sheet/Line%20456/2007_LL8.xls 2007 LLR Spec Sheet]}}</ref>

Applications:
* 2002–2009 [[GMC Envoy]], ''Envoy XL'', and ''Envoy XUV''
* 2002–2009 [[Chevrolet TrailBlazer]] and ''TrailBlazer EXT''
* 2002–2004 [[Oldsmobile Bravada]]
* 2004–2007 [[Buick Rainier]]
* 2003–2008 [[Isuzu Ascender]]
* 2005–2009 [[Saab 9-7X]] 4.2i