Featured Engine: GM LS Engines Gen III & IV


The 'LS' line of engines from GM has been hugely popular since they were first unveiled, taking over for the famous small block line of engines. The Gen III and Gen IV versions of the LS engines were offered in many pick up, van, SUV and car applications and ranged from 4.8L to 7.0L sizes. The later model versions of this engine, like this 5.3L Chevy engine, feature Active Fuel Management (AFM) to increase fuel economy and decrease emissions.

Tri Star remanufactured GM 5.3 and 6.0 L GM LS engines for sale are built to meet or exceed OEM standards and our backed by our standard 3 year, unlimited mileage nationwide warranty (private use applications). For total peace of mind you can also upgrade to our 'No Fault' Warranty Supplement, call for details. All Tri Star remanufactured engines incorporate the latest updates to correct original design flaws - Click here for the product bulletin outlining the updates of Tri Star remanufactured 5.3 and 6.0 L GM LS engines. Tri Star engines are remanufactured, not rebuilt, for the most reliable and durable engines available. Tri Star remanufactured 5.3 and 6.0 L GM LS engines are completely remanufactured including machining the block, crank, connecting rods and cylinder heads, and assembled with new or remanufactured parts. Rebuilt GM 5.3L and 6.0L LS engines will only correct the issue with the "core" engine used as raw material, but will typically not include any other machining or remanufacturing on the rest of the engine or have any updates performed. Used engines incorporate no updates and are extremely susceptible to failure due to mileage already being on the engine with questionable maintenance records. Used and rebuilt 5.3L and 6.0L LS engines are inferior, do not correct any of the original equipment design flaws and typically have very limited or pro-rated warranties. When shopping be sure to ask if you're getting a used, rebuilt 5.3L and 6.0L LS engine or a 100% remanufactured engine.



Be sure to use our online lookup or call our engine experts to ensure proper fitment for your application. Don't worry, the Vehicle Identification Number (VIN) from your vehicle is required at time of order as well. Our most popular LS engines are shown below, however this list is not all inclusive.


Part # P4154
Make Model Years
Cadillac Escalade 2002-2005
Chevrolet Avalanche 1500 2002-2006
Chevrolet Express 1500 2003-2007
Chevrolet Express 2500  
Chevrolet Silverado 1500  
Chevrolet Silverado 2500  
Chevrolet Suburban 1500  
Chevrolet Tahoe  
GMC Savana 1500  
GMC Savana 2500  
GMC Sierra 1500  
GMC Sierra 2500 2004-2008
GMC Yukon 2006-2008
GMC Yukon XL 1500 2005-2008
Part # P4227
Make Model Years
Chevrolet Silverado 1500 2005-2007
GMC Sierra 1500 2005-2007
Part # P4221 - aluminum block
Make Model Years
Chevrolet Avalanche 2007-2009
Chevrolet Silverado 1500 2007-2009
Chevrolet Suburban 1500 2007-2009
Chevrolet Tahoe 2009
GMC Sierra 1500 2007-2009
GMC Yukon 2009
GMC Yukon XL 1500 2007-2009
Saab 9-7x 2007-2009









Part # P4218 - cast iron block
Make Model Years
Chevrolet Avalanche 2007-2009
Chevrolet Silverado 1500 2007-2009
Chevrolet Suburban 1500 2007-2009
Chevrolet Tahoe 2007-2009
GMC  Sierra 1500  2007-2009 
GMC  Yukon  2007-2009 
Part # P4264 - aluminum block
Make Model Years
Chevrolet Avalanche 2011-2013
Chevrolet Silverado 1500 2010-2013
Chevrolet Suburban 1500 2010-2014
Chevrolet Tahoe 2010-2011
GMC Sierra 1500 2010-2013
GMC Yukon 2010
GMC Yukon XL 1500 2010-2014
Part # P4263 - cast iron block
Make Model Years
Chevrolet Avalanche 2010-2013
Chevrolet Silverado 1500 2010-2013
Chevrolet Suburban 1500 2010-2014
Chevrolet Tahoe 2010-2014
GMC Sierra 1500 2010-2013
GMC  Yukon  2010-2014 
GMC Yukon XL 1500 2010-2014







Part # P4155
Make Model Years
Chevrolet Express 2500 2003-2007
Chevrolet Express 3500 2003-2007
Chevrolet  Silverado 1500HD  2001-2006 
Chevrolet  Silverado 2500  2001-2004 
Chevrolet  Silverado 2500HD  2001-2006 
Chevrolet  Silverado 3500  2001-2006 
Chevrolet  Suburban 1500  2006 
Chevrolet  Suburban 2500  2001-2006 
GMC  Savana 2500  2003-2007 
GMC  Savana 3500  2003-2007 
GMC  Sierra 1500  2002-2004 
GMC  Sierra 1500 HD  2001-2006 
GMC  Sierra 2500  2001-2004 
GMC  Sierra 2500 HD  2001-2006 
GMC Sierra 3500  2001-2006 
GMC Yukon XL 1500  2001-2006 
GMC Yukon XL 2500  2001-2006 
Hummer H2  2003-2007 
Part # P4184
Make Model Years
Chevrolet Silverado 2500 1999-2000
Chevrolet Suburban 2500 2000
GMC Sierra 2500  1999-2000
GMC  Yukon XL 2500 2000
Part # P4228
Make Model Years
Cadillac Escalade 2002-2006
Chevrolet Silverado 1500 2003-2006
GMC Sierra 1500 2005-2006





Part # P4230
Make Model Years
Chevrolet Express 2500 2008-2010
Chevrolet Express 3500 2008-2010
Chevrolet Silverado 2500HD 2007-2010
Chevrolet Silverado 3500HD 2007-2010
Chevrolet Suburban 2500 2007-2010
 GMC Savana 2500 2008-2010
GMC Savana 3500 2008-2010
GMC Savana 4500 2009-2010
GMC Sierra 2500 HD 2007-2010
GMC Sierra 3500 HD 2007-2010
GMC Yukon XL 2500 2007-2010
Part # P4265
Make Model Years
Chevrolet Express 2500 2011-2012
Chevrolet Express 3500 2011-2012
Chevrolet Silverado 2500HD 2011-2012
Chevrolet Silverado 3500HD 2011-2012
Chevrolet Suburban 2500 2011-2012
GMC Savana 2500 2011-2012
GMC Savana 3500 2011-2012
GMC Savana 4500 2011-2012
GMC Sierra 2500 HD 2011-2012
GMC Sierra 3500 HD 2011-2012
GMC Yukon XL 2500 2011-2012








 The 5.3L and 6.0L LS engines are notorious for having cracked cylinder heads, excessive oil consumption, and lifter noise (on Gen IV engines).  Tri Star remanufactured 5.3L and 6.0L LS engines address these most common failure points in the remanufacturing process to provide the most durable and dependable engines.

Cracked cylinder heads (coolant leaks) •Tri Star pressure tests the cylinder heads twice to ensure there are no cracks in the cylinder head. Cylinder heads are first pressure tested individually and then once more when assembled on the engine. Some competitors only pressure test the cylinder heads before assembly which can not show cracks which are only visible when the heads are torqued to the cylinder block.
Leaking timing cover and/or oil pan •Tri Star includes the timing cover and oil pan installed on this engine. Timing covers are checked and machined for straightness to ensure a good seal. All engines are simulation tested and black light checked for leaks during testing.
Lifter noise (Gen IV) •Tri star only uses the most recent design of the Active Fuel Management (AFM) lifters for the best oil flow to reduce lifter noise on startup
Premature bearing failure or engine knocking •Blocks and cranks are completely remanufactured to exact tolerances utilizing CNC machining equipment
•Crankshafts are micro-polished to extend bearing life. Unlike some competitors, the tape used for micro-polishing cranks at Tri Star is only used once and in only one direction. Reusing tape back and forth can cause fine metal particles to become impregnated in the journal and cause premature failure.
•Tri Star LS long blocks include the oil pan and pickup tube installed to avoid contamination issues. Some competitors offer the engine without the pickup tube installed which risks it being exposed to dirt/debris that will plug the pickup screen.
Low oil pressure •Tri star designed cam bearings provide tighter oil tolerances than OE cam bearings. These are not an "off-the-shelf" part number for any bearing manufacturer and were created in collaboration with one of the high quality bearing vendors Tri Star works with.
•A brand new oil pump is used for the most reliable pressure and flow (some competitors rebuild or reuse old oil pumps)
Oil consumption problems •Tri Star installs an oil pressure relief valve baffle (OE part # 12639759) on all 2007 and later applications that did not have this included from the OE. This relief valve baffle redirects oil back to the oil pan.
•Compression height on the pistons is reduced to maintain factory compression ratio specifications.
•Both the block and cylinder heads are precision machined to exact specifications.



  • A brand new OE AFM oil manifold is installed - Part number 12571609 - some competitors do not include this expensive part or use an inferior brand 
  • Graphite coated hypereutectic pistons resist scuffing and damage to heat much better than factory aluminum pistons
  • Moly piston rings and steel compression rings reduce friction and cylinder wall wear to extend the life of the engine
  • Multi-Layer Steel (MLS) head gaskets are used which resist heat and avoid head gasket failures
  • Fel-Pro® rear main seals protect against heat and leaks
  • Connecting rods are honed (both the little and big ends) to ensure uniformity, and bent rods are scrapped (some competitors will bend rods back into place)
  • Chrome plated valve stems resist scuffing and heat for greater durability
  • Soda blasting aluminum components provides a visually 'like new' raw material without the risk of contaminating the engine (some competitors blast with  other abrasive materials which can become stuck in the engine and cause the new engine to fail)
  • Every engine is 100% simulation tested very thoroughly by skilled technicians. Engines are checked for good compression, oil pressure, and black light checked for any leaks before packaging
  • Engines are provided with a written warranty which clearly outlines coverages. Unlike some competitors, Tri Star warranties are not 'pro-rated' which decrease your coverage over time
  • Engines are shipped in plastic totes with simple core return instructions provided to make returning cores extremely simple
  • Excellent product support technicians aren't just order takers, they are knowledgeable customer service experts
  • You're buying your remanufactured 5.3L direct from the manufacturer so you know you aren't dealing with a middle man for increased costs and headaches for warranty, core returns and technical assistance


5.3L/6.0L LS Product BulletinProduct Bulletin  (spacer) 'No Fault' Warranty Supplement Bulletin"No Fault" Flyer (spacer) Product Line BulletinProduct Line Flyer (spacer) Refer-A-Friend FlyerRefer-A-Friend

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If you have any questions or need assistance, please give us a call at 1-800-322-5859 or contact us today!