Quick answers
GM / Chevy 6.0L replacement engine FAQs
LQ4 vs LQ9, L76 vs LY6, L96 fitment, VIN U/N/Y/K/G, VVT, AFM/DOD, Express/Savana cutaway fitment, 366 Mark V/VI engines and core deposits.
Are all GM 6.0L engines interchangeable? +
No. The active catalog includes LQ4, LQ9, L76, LY6 and L96 LS-family engines plus separate 366 Mark V/VI medium-duty engines. Match engine code, VIN and hardware before ordering.
What is the bore and stroke of the LS-based GM 6.0L? +
Chevrolet documentation lists the 6.0L / 364-cubic-inch LS-family bore and stroke at 4.000 inches by 3.622 inches.
What is the difference between LQ4 and LQ9? +
Both are Gen III LS-based 6.0L engines in this catalog, but they have separate engine codes and VIN paths. LQ4 is listed as VIN U; the LQ9 product is VIN N and covers Escalade, Sierra and Silverado applications.
What is the difference between L76 and LY6? +
The source catalog lists the 2007-2008 L76 as VIN Y with an aluminum block, aluminum heads, VVT and DOD/AFM. The 2007-2008 LY6 is VIN K with a cast block, aluminum heads, VVT and no DOD/AFM.
What is an L96 6.0L engine? +
Chevrolet Performance identifies L96 as a Gen IV 6.0L small-block V8 with a cast-iron block and aluminum rectangular-port heads. In the current GOAT catalog it covers later heavy-duty truck, Suburban/Yukon and Express/Savana applications.
Why are there two L96 products? +
The source catalog separates standard van/heavy-duty applications from the later cutaway-chassis path. The 2009-2016 product specifically excludes cutaway on the 2010-2016 van fitment, while the 2011-2018 product covers Express/Savana cutaway chassis.
What VIN codes are used on these GM 6.0L engines? +
The current catalog uses VIN U on early/LQ4 products, VIN N on LQ9, VIN Y on L76, VIN K on LY6 and VIN K/G on later L96 applications. Always confirm the engine code in addition to the VIN character.
Are the 366 Mark V/VI engines LS engines? +
No. The two 366-cubic-inch medium-duty products are a separate engine family. The source identifies 1991-1995 Mark V with 10-bolt front-cover bosses and 1996-2000 Mark VI with 6-bolt front-cover bosses.
How much is the refundable core charge? +
The current GM 6.0L products use refundable core deposits of $350, $450, $550, $650 or $800 depending on the engine. The live product card and checkout use the fee assigned to that specific product.
Does the Year/Make/Model finder use NHTSA? +
No. The collection finder uses GOAT’s embedded catalog fitment data. NHTSA is only used in the separate VIN-decoder workflow.
Why can one vehicle show more than one GM 6.0L result? +
Some model years overlap between engine codes such as L76 and LY6 or between standard/cutaway L96 application paths. Multiple results are intentional when another identifier is required.
How do I confirm the correct GM 6.0L before ordering? +
Start with Year/Make/Model, then verify the full VIN, engine code, VIN engine character, block material, VVT/AFM status and standard-van versus cutaway chassis where applicable.
