4.2 Liter Engines: The Chevrolet 4.2-liter inline-6 engine is also referred to as the Vortec 4200 or 4.2 Vortec and the Atlas LL8 engine. A common problem which can cause a breakdown is an engine misfire due to worn valve seats.
LL8 - The LL8 was a part of the Atlas engine class, noted for its inline piston design. It had a dual overhead-cam design inline 6 cylinder engine and produced 275 hp. This engine was found in the 2002-2009 Chevrolet TrailBlazer and TrailBlazer EXT, 2002-2009 GMC Envoy, 2002-2004 Oldsmobile Bravada, 2004-2007 Buick Rainier, 2003-2008 Isuzu Ascender, and the 2005-2009 Saab 9-7x 2i.
4.2L Inline-6 Engine for 2005 Buick Rainier/Chevrolet Trailblazer, Trailblazer EXT/GMC Envoy, Envoy XL, Envoy XUV/Isuzu Ascender/Saab 9-7x
$3,829.00
4.2L Inline-6 Engine for 2002-2004 Buick Rainier/Chevrolet Trailblazer, Trailblazer EXT/GMC Envoy, Envoy XL, Envoy XUV/Isuzu Ascender/Oldsmobile Bravada
$3,793.00
4.2L Inline-6 Engine for 2006-2007 Buick Rainier/Chevrolet Trailblazer, Trailblazer EXT/GMC Envoy, Envoy XL/Isuzu Ascender/Saab 9-7x
$4,147.00
4.2L Inline-6 Engine for 2008-2009 Chevrolet Trailblazer/GMC Envoy/Isuzu Ascender/Saab 9-7x
$4,147.00