Complete LS Engine Specs & Differences Guide

JEGS Tech Specialist

Pete Mitchell

One of the most popular engines today, the family and series of LS GM engines powers many cars, trucks, and SUVs. In addition, LS motors are a popular engine to swap into older vehicles to give them modern performance. It is important to understand all of the differences and types of LS motors before beginning a build. Below are the most common questions about the LS-series family of motors, including LS engine specs.

Which GM Cars Have LS Engines?

The following list identifies which LS engines were installed in GM / Chevy cars, trucks, and SUVs, as well as VIN codes, LS engine horsepower & torque ratings, specs, and additional info:

GEN III LS Engine Family

LS1 / 5.7 Liter – VIN G, 1997-2000 – 345 HP / 350 TQ, 2001-2004 – 350 HP / 365 TQ, Aluminum Block / Heads (Cathedral Port) , 3.898“ Bore × 3.622” Stroke

-1997-2004 Chevrolet Corvette

-1998-2004 Chevrolet Camaro Z28 / SS

-1998-2002 Pontiac Firebird Formula, Trans Am

-2004 Pontiac GTO

LS6 / 5.7 Liter – VIN S, 2001 – 385 HP / 385 TQ, 2002-2005 – 405 HP / 400 TQ, Aluminum Block / Heads (Cathedral Port) , 3.898“ Bore × 3.622” Stroke

-2001-2004 Chevrolet Corvette

-2004-2005 Cadillac CTS-V

LR4 / 4.8 Liter – VIN V, 1999 - 255 HP / 285 TQ, 2000-2007 – Between 270–285 HP / 285–295 TQ, Cast Iron Block, Aluminum Heads (Cathedral Port), 3.78” Bore × 3.27” Stroke

-1999-2006 Chevrolet Silverado / GMC Sierra 1500 Pickup Trucks

-2000-2006 Chevrolet Tahoe / GMC Yukon Full-Size SUVs

-2003-2006 Chevrolet Express / GMC Savana Vans

-2007 “Classic” Chevrolet Silverado / GMC Sierra 1500 Pickup Trucks

LM7 / 5.3 Liter – VIN T, 1999 - 270 HP / 315 TQ, 2000-2003 - 285 HP / 325 TQ, 2004-2007 - 295 HP / 335 TQ, Cast-Iron Block/Aluminum Heads (Cathedral Port), 3.78” Bore × 3.62” Stroke

1999–2007 Chevrolet Silverado / GMC Sierra 1500 Pickup Trucks

2000–2006 Chevrolet Suburban / Tahoe & GMC Yukon / Yukon XL 1500 SUVs

2002–2005 Cadillac Escalade 2WD SUVs

2002–2006 Chevrolet Avalanche Pickup Trucks

2003–2007 Chevrolet Express/GMC Savana Vans

L59 / 5.3 Liter – VIN Z, Flex-Fuel, 2002-2003 = 285 HP / 320 TQ, 2004-2007 = 295 HP / 335 TQ, Cast-Iron Block/Aluminum Heads (Cathedral Port), 3.78” Bore × 3.62” Stroke

2002–2006 Chevrolet Tahoe/GMC Yukon & 2002–2006 Chevrolet Suburban/GMC Yukon XL 1500 SUVs

2002–2007 Chevrolet Silverado 1500 / GMC Sierra 1500 & Chevrolet Avalanche Z71 Pickup Trucks

LM4 / 5.3 Liter – VIN P, 2003-2005 - 290 HP / 325 TQ, Aluminum Block / Heads (Cathedral Port), 3.78” Bore × 3.62” Stroke

2003-2004 Chevrolet SSR / GMC Envoy XL Pickup Trucks & SUVs

2003–2005 Chevrolet Trailblazer EXT SUVs

2004 Buick Rainier / GMC Envoy XUV SUVs

L33 / 5.3 Liter – VIN B, 2005-2007 - 310 HP/335 TQ, Aluminum Block / Heads (Cathedral Port), 3.78” Bore × 3.62” Stroke

2005–2007 Chevrolet Silverado / GMC Sierra 1500 4WD Extended Cab Pickup Trucks

LQ4 / 6.0 Liter – VIN U, 1999-2000 – 300-325 HP/360-370 TQ, Cast-Iron Block/Heads (Cathedral Port), 4.00” Bore × 3.62” Stroke

1999-2000 Chevrolet Express/GMC Savana Vans

1999-2000 Chevrolet Suburban/GMC Yukon XL Denali SUVs

1999-2000 Chevrolet Silverado / GMC Sierra 2500 HD, 3500 Crew Cab & Chassis Cab and 1500HD Crew Cab Pickup Trucks

LQ9 / 6.0 Liter – VIN N, 2002-2007 – 345 HP / 380 TQ, Cast-Iron Block / Aluminum Heads (Cathedral Port), 4.00” Bore × 3.62” Stroke

2002–2006 Cadillac Escalade AWD & EXT SUVs

2003–2006 Cadillac Escalade ESV SUVs

2003–2007 Chevrolet Silverado SS Pickup Trucks

2004–2006 Chevrolet Silverado / GMC Sierra Vortec HO Edition, Performance Edition

2005-2006 GMC Sierra Denali pickup trucks and Yukon Denali SUVs

2006 Cadillac Escalade 2WD SUVs

2007 Classic Chevrolet Silverado / GMC Sierra VortecMAX & Performance Edition pickup trucks

GEN IV LS-Series Engines

LS2 / 6.0 Liter – VIN H, 2005 -2009 – 400 HP / 400 TQ, Aluminum Block/Heads (Cathedral Port), 4” Bore x 3.622” Stroke

2005-2006 Chevrolet SSR & Pontiac GTO

2005-2007 Chevrolet Corvette

2006–2007 Cadillac CTS V-Series

2006–2009 Chevrolet Trailblazer SS SUVs

L76 / 6.0 Liter – VIN Y, Active Fuel Management (AFM) / Displacement On Demand (DOD), 2007-2009 – 361-367 HP / 375-385 TQ, Aluminum Block/Heads (Rectangle Port), 4” Bore x 3.622” Stroke

2007–2009 Chevrolet Silverado / Suburban / Avalanche & GMC Sierra / Yukon XL Pickup Trucks & SUVs

2008–2009 Pontiac G8 GT

L77 / 6.0 Liter – VIN 2, Flex Fuel, Active Fuel Management (AFM) / Displacement On Demand (DOD), 2011-2017 – 362 HP / 391 TQ, Aluminum Block/Heads (Rectangle Port), 4” Bore x 3.622” Stroke

2011-2017 Chevrolet Caprice Police Pursuit Vehicles

LY6 / 6.0 Liter – VIN K, 2007 -2013 – 361 HP / 385 TQ, Variable Valve Timing (VVT), Cast Iron Block/ Aluminum Heads (Rectangle Port), 4” Bore x 3.622” Stroke

2007–2009 Chevrolet Silverado HD / GMC Sierra HD pickup trucks

2007–2013 Chevrolet Suburban 2500 / GMC Yukon XL 2500 SUVs

L96 / 6.0 Liter – Flex-Fuel – VIN G, 2010-2020 - 361 HP / 385 TQ, Variable Valve Timing (VVT), Cast Iron Block/ Aluminum Heads (Rectangle Port), 4” Bore x 3.622” Stroke

2010–2013 Chevrolet Suburban 2500 / GMC Yukon XL 2500 SUVs

2010–2019 Chevrolet Silverado HD / GMC Sierra HD Pickup Trucks

2010–2020 Chevrolet Express / GMC Savana Vans

2016–2020 Chevrolet Suburban 3500 SUVs

LFA / 6.0 Liter – Hybrid – VIN 5, 2008–2009 – 332 HP / 367 TQ, Aluminum Block/Heads (Rectangle Port), 4” Bore x 3.622” Stroke

2008–2009 Chevrolet Tahoe Hybrid / GMC Yukon / Cadillac Escalade Hybrid SUVs

2008-2009 Chevrolet Silverado Hybrid / GMC Sierra Hybrid Pickup Trucks

LZ1 / 6.0 Liter – Hybrid / Active Fuel Management (AFM) / Variable Valve Timing (VVT), VIN J, 2010-2013 - 332 HP / 367 TQ, Aluminum Block/Heads (Rectangle Port), 4” Bore x 3.622” Stroke

2010–2013 Chevrolet Tahoe Hybrid / GMC Yukon Hybrid / Cadillac Escalade Hybrid SUVs

2010–2013 Chevrolet Silverado Hybrid / GMC Sierra Hybrid pickup trucks

LY2 / 4.8 Liter – VIN C, 2007-2009 – 260-295 HP / 295-305 TQ, Cast-Iron Block/ Aluminum Heads (Cathedral Port), 3.78” Bore × 3.27” Stroke

2007–2009 Chevrolet Silverado / GMC Sierra pickup trucks

2007–2009 Chevrolet Tahoe / GMC Yukon SUVs

2008–2009 Chevrolet Express/GMC Savana Vans

L20 / 4.8 Liter – VIN A, Variable Valve Timing (VVT), 2010 – 2017 – 260-302 HP / 295-305 TQ, Cast Iron Block, Aluminum Heads (Cathedral Port), 3.78” Bore × 3.27” Stroke

2010–2013 Chevrolet Silverado / GMC Sierra pickup trucks

2010–2017 Chevrolet Express/GMC Savana Vans

LMF / 5.3 Liter – VIN 4, 2010-2014 – 301 HP / 325 TQ, 3.78” Bore x 3.622” Stroke, Cast Iron Block / Aluminum Heads (Cathedral Port)

2010-2014 Chevrolet Express 1500 AWD / GMC Savana 1/2 ton AWD vans

L94 / 6.2 Liter - VIN F, Active Fuel Management (AFM), Variable Valve Timing (VVT), 2010-2014 - 403 HP / 417 TQ, 4.065 Bore x 3.622" Stroke, Aluminum Block / Aluminum Heads (Rectangle Port)

2010 - 2014 Cadillac Escalade ESV / EXT , GMC Yukon / Yukon XL

LH6 / 5.3 Liter – VIN M, Active Fuel Management (AFM), 2005-2009- 300-315 HP / 330-338 TQ, Aluminum Block/Heads (Cathedral Port), 3.78” Bore x 3.622” Stroke

2005 GMC Envoy XUV

2005–2006 GMC Envoy XL

2005–2007 Buick Rainier

2005–2009 Chevrolet Trailblazer / Trailblazer EXT (2005-2006) / GMC Envoy Denali SUVs

2007-2009 Chevrolet Silverado 1500 / GMC Sierra 1500

LY5 / 5.3 Liter – VIN J, 2007-2014 – 315-320 HP / 335-340 TQ (pickups), 320 HP / 340 TQ (SUVs), Cast Iron Block / Aluminum Heads (Cathedral Port), 3.78” Bore x 3.622” Stroke

2007–2013 Chevrolet Silverado 1500 & Avalanche / GMC Sierra 1500 pickup trucks

2007–2014 Chevrolet Suburban 1500 & Tahoe / GMC Yukon & Yukon XL 1500

LMG / 5.3 Liter – VIN 0, flex fuel, 2010-2014 -Variable Valve Timing (VVT), 2007-2014 - 315-320 HP / 335-340 TQ (pickups), 320 HP / 340 TQ (SUVs), Cast Iron Block / Aluminum Heads (Cathedral Port), 3.78” Bore x 3.622” Stroke

2007–2013 Chevrolet Silverado 1500 & Avalanche / GMC Sierra 1500

2007–2014 Chevrolet Suburban 1500 & Tahoe / GMC Yukon & Yukon XL 1500

LC9 / 5.3 Liter – VIN 3 or 7, flex fuel, 2010-2014 – Variable Valve Timing (VVT), 2007-2014 – 315 HP / 335 TQ (Pickups), 320 HP / 335 TQ (SUVs), Aluminum Block / Heads (Cathedral Port), 3.78” Bore x 3.622” Stroke

2007–2013 Chevrolet Avalanche, Silverado 1500 / GMC Sierra 1500 4WD pickup trucks

2007–2014 Chevrolet Suburban 1500 / GMC Yukon XL 1500 4WD SUVs

LH8 / 5.3 Liter – VIN L, 2008-2009 – 300 HP / 320 TQ, Aluminum Block / Heads (Cathedral Port), 3.78” Bore x 3.622” Stroke

2008–2009 Hummer H3 Alpha off-road vehicle

2009 Chevrolet Colorado/GMC Canyon pickup trucks

LH9 / 5.3 Liter – VIN P, Flex-Fuel, Variable Valve Timing (VVT), 2010-2012 – 300 HP / 320 TQ, Aluminum Block / Heads (Cathedral Port), 3.78” Bore x 3.622” Stroke

2010 Hummer H3 Alpha

2010–2012 Chevrolet Colorado/GMC

LS4 / 5.3 Liter – VIN C, Active Fuel Management (AFM), 2005-2009 – 303 HP / 323 TQ, 3.78”, Aluminum Block / Heads (Cathedral Port), Bore x 3.622” Stroke

2005–2008 Pontiac Grand Prix GXP

2006–2007 Chevrolet Monte Carlo SS

2006–2009 Chevrolet Impala SS

2008–2009 Buick LaCrosse Super

LS7 / 7.0 Liter – VIN E, 2006-2015 – 505 HP / 470 TQ, Aluminum Block / Heads (Raised Rectangle Port), 4.125 Bore x 4” Stroke

2006–2013 Chevrolet Corvette Z06

2013 Corvette 427 Convertible

2014-2015 Chevrolet Camaro Z/28

L92 / 6.2 Liter – VIN 8, Variable Valve Timing (VVT), 2007-2013 – 403 HP / 415-417 TQ, Aluminum Block/Heads (Rectangle Port), 4.065” Bore x 3.622” Stroke

2007-2008 Cadillac Escalade

2007-2013 GMC Yukon Denali/Denali XL & Sierra Denali

2008-2009 Chevrolet Tahoe / Hummer H2

L9H / 6.2 Liter - VIN 2, Variable Valve Timing (VVT), 2009 - 2013 - 403 HP / 417 TQ, Aluminum Block / Heads (Rectangle Port), 4.065" Bore x 3.622" Stroke

2009 Cadillac Escalade ESV / EXT , Chevrolet Tahoe LTZ, GMC Yukon Denali

2009 - 2013 GMC Yukon XL 1500 SLT, Sierra 1500 Denali / SLE / SLT

2010-2013 Chevrolet Silverado 1500 LT / LTZ

LS3 / 6.2 Liter – VIN W, 2008-2017 - 430 HP / 424 TQ, Aluminum Block /Heads (Rectangle Port), 4.065” Bore x 3.622” Stroke

2008–2013 Chevrolet Corvette

2009 Pontiac G8 GXP

2010–2015 Chevrolet Camaro SS (manual transmission only)

2014–2017 Chevrolet SS

L99 / 6.2 Liter – VIN J, Active Fuel Management (AFM), Variable Valve Timing (VVT), 2010-2015 – 400 HP / 410 TQ, Aluminum Block / Heads (Rectangle Port), 4.065” Bore x 3.622” Stroke

2010–2015 Chevrolet Camaro SS (Automatic Transmission only)

LS9 / 6.2 Liter, Supercharged – VIN T, 2009-2013 – 638 HP / 604 TQ, Aluminum Block / Heads (Rectangle Port), 4.065” Bore x 3.622” Stroke, LS Performance Engine

2009–2013 Chevrolet Corvette ZR1

LSA / 6.2 Liter, Supercharged – VIN P, 2009-2015 – 556 HP / 551 TQ, Aluminum Block / Heads (Rectangle Port) , 4.065” Bore x 3.622” Stroke, LS Performance Engine

2009–2015 Cadillac CTS-V

2012–2015 Chevrolet Camaro ZL1

LS Engine Block Casting Numbers

LS Engine Block Casting Number Location: Left rear, top of block just forward of the bellhousing mounting surface.

12480030 - 2003-2004 GM Performance Products non-production block
12550592 - 1997-1999 LS1 (First Production Year - 1997 Corvette. For 1998 Corvette / Camaro / Firebird casting improvements for added strength.
12551358 - 1998-1999, 2001-2005 LM7 / LR4
12551364 - 1998-1999 LQ4, 2001-2005 LQ4/LQ9
12559090 - 1998 LS1 (mid-year revision with new cam bushing material)
12559378 - 2000-2002 LS1 (with a cored rear cover oil passage design change).
12559846 - 1998-2000 LS1 (improved cylinder liner design over older blocks and a cored rear cover oil passage design change)
12560626 - 2000 LS1 (with a cored rear cover oil passage design change).
12561166 - 2001 LS1/LS6
12561168 - 2001-2004 LS1/LS6 (first year for bulkhead vent windows in #2, #3, and & #4 bulkheads which eliminated the need for 28.5 mm drilled vent hole)
12562735 - 2005 L33 / LS2
12566910 - 2003-2005 LM4
12567392 - 2002-2005 LM7 / LR4
12567393 - 2005 LM7 / LR4
12573581 - 2002-2005 LQ4/LQ9
12577184 - 2005 LQ4/LQ9

LS Cylinder Head Casting Numbers

LS Cylinder Head Casting Number Location: externally at the far right end of the head on the exhaust-port side.

• casting # ending in 241 - LS1 , with 2.00 / 1.55 valves, 200cc intake port, 67cc chambers, 200 intake port volume, cathedral ports, 70cc exhaust port volume, aluminum

• casting # ending in 243,799, and 823 - LS1/LS6 , with 2.00 / 1.55 valves, 65cc chambers, cathedral ports

243 castings are aluminum, 210cc intake port volume, 75cc exhaust port volume

• casting # ending in 706, 852, 862, and 895 – LM4/LM7/LR4 , with 1.89 / 1.55 valves, 61cc chambers, cathedral ports

706 and 852 castings are aluminum, 200cc intake port volume, 70cc exhaust port volume

• casting # ending in 853, 806, and 933 - LS1 , with 2.00 / 1.55 valves, 67cc chambers, cathedral ports

casting # 806 and 933 have perimeter valve cover bolts, aluminum, 200cc intake port volume, 70cc exhaust port volume

• casting # 853 is aluminum, 200cc intake port volume, 70cc exhaust port volume

• casting # ending in 317 and 035 – LQ4/LQ9 , with 2.00 / 1.55 valves, 71cc chambers, cathedral ports

317 castings are aluminum, desirable for boosted applications, 210cc intake port volume, 75cc exhaust port volume.

• casting # ending in 373 and 873 – LQ4 , with 2.00 / 1.55 valves, 71cc chambers, rectangle ports

873 castings are cast iron, 210cc intake port volume, 75cc exhaust port volume

• casting # ending in 364, 716, and 823 – L92/LS3 , with 2.165 / 1.590 valves, 68cc chambers, rectangle ports - Desirable for non-boosted engines with good flow, raised runner floor, & wider port opening

716 castings are aluminum, 257cc intake port volume, 86cc exhaust port volume

• casting # ending in 452 – LS7 , with 2.20 / 1.610 valves, 70cc chambers, rectangle (raised) ports

LS Block And Cylinder Head Compatibility

LS1 blocks can only use LS1, LS6 and LS2 heads. Using cylinder heads designed for larger engines will cause valve-to-block interference

LS2 blocks with the larger, 4.00-inch bore enables them to use LS1/LS6 heads, as well as L92-style heads.

The LS3 block can use any cylinder head except for the LS7 and C5R.

LS6 blocks can only use LS1, LS6 and LS2 heads. Using heads designed for larger engines will cause valve-to-block interference.

LS7 blocks should be matched with heads designed for at least 4.10-inch bores; and 4.125-inch bores are preferred.

LQ4 blocks (with 4.000" cylinder bores) can accommodate the GM L92 heads

LS Factory Crankshafts

The 1999 & 2000 LQ4 engine came stock with a 0.44" longer crankshaft to accommodate the 4L80E transmission engine/tranny combination that was offered in the stock vehicles during that period. The early LQ4 blocks can run the older SBC style transmissions like the TH350, 700R4 and TH400 with no problem. If you want a newer LQ4 block to run an old style transmission, you have to install an older style crankshaft into the block or use a crank spacer for the flexplate.

LS Factory Connecting Rods And Pistons

Factory pistons are definitely the weak point of the LS family. Assuming you're looking at a non-LSA/LS9 engine, you're looking at hypereutectic pistons that won't survive under high horsepower or boost. However, at the 500-600 horsepower level, they will do for budget builds. The LS7 piston and LS3 piston is a little more stout than the truck or LS1/LS2 units; so you might be able to push things a little bit. However, inexpensive pistons are cheap enough that if you're scouring the junkyard for pistons you are probably penny-wise and pound-foolish. The same thing applies to connecting rods. If you're looking for pistons or connecting rods, for the most part, aftermarket offerings are inexpensive and strong.

LS Intake Manifolds

The factory LS6 intake is pretty decent flowing, as is the LS3 and LS7. The truck engine intake flows a lot of air but it's also the tallest. If there are space issues with the intake fitting under the hood, the lower profile intake will be required. The Z06 style manifold is the better one of the car intakes and the intake off of an F-body Camaro/Firebird (LS1) will bolt to the truck blocks and work well when space is limited under the hood. The LS1/LS3/LS7 F-body intake includes fuel rails that are a return-less design, resulting in less cost and less plumbing and less work.

LS Throttle Body Differences

LS Drive-by-Wire vs Drive-by-Cable

1997 and up Corvettes came with throttle-by-wire throttle body systems, while 1998-2002 F-Bodies (Camaro and Firebird) had cable-driven throttle bodies. By 2004/2005, all GM vehicles with LS engines had drive-by-wire throttle body systems.

Transplanting an LS6 could become an issue because the 2001-2004 Vettes came with throttle-by-wire throttle bodies and electronics to operate them. You must have the accelerator pedal and TAC module from a 2001-2004 Vette that match the PCM programming to use the stock throttle body.

GM's V8 throttle by wire lineup consisted of 2000-2002 Gen 3 truck engines and 2003-2006 Gen 3 truck engines with either the 4L60E or 4L80E transmissions. The difference between earlier throttle-by-wire and the later version is because of a throttle body design change for the Gen 3 truck engines.  Engines built in 2002 or earlier came with a throttle body much like the LS1 in the Corvette.  These throttle bodies are easily identified by the black TAC motor on the passenger side of the throttle body and the TPS opposite to it.  2003 and later throttle bodies have the TAC motor and TPS both on the passenger side.

Aftermarket fuel injection wiring harnesses can be purchased to adapt these throttle-by-wire systems to work in your transplant vehicle or you can swap out to a throttle by cable type throttle body. The most popular throttle body conversions include the LS1 or LS6 throttle-by-cable throttle body.

LS Throttle Body Bolt Patterns

Three-bolt throttle bodies were available from 1997-2004 and four-bolt throttle bodies began with LS2 engines around 2005 and continue for all throttle bodies to present day (for LS and LT engines)

Throttle Body Bore Sizes

Most factory intake manifolds will not properly seal with a throttle body using a 90mm (and sometimes 92mm) or larger throttle bore without proper modification. 75mm throttle bodies are found on early 3-bolt designs of the LS1 Corvettes starting in 1997, which also had coolant plumbed through them to help cold-climate warm-up.

LS2 engines (starting in 2005) have the four-bolt mounting pattern with the 90mm bore and redesigned with the coolant pipe removed.

LS3 drive-by-wire throttle bodies starting in 2008 used 90mm bores with a 4-bolt mounting pattern, identified with a gold-finish throttle blade which opened in the opposite direction from the LS2.

VATS Systems

The 1998-2002 LS1 equipped Camaro and Trans Am cars used a PWM VATS system as an anti-theft device. A VATS module in the steering column transmits a PWM signal to the ECM if the proper ignition key is inserted into the key switch. If the improper key is inserted, the system disables the injector pulses after 2 seconds of engine run time. When transplanting the engine from one of these vehicles, the VATS system must be defeated. Painless Performance offers a kit that will accomplish this.

The 1997-2004 LS1 Corvettes use a serial VATS system. The ECM and BCM use serial communication which is not defeatable by an add-on VATS module.

The 2001-2004 LS6 Corvettes use a serial VATS system. The ECM and BCM use serial communication which is not defeatable by an add-on VATS module. Best option on these is to use a different throttle body / ignition system or carburetor.

All trucks manufactured with Gen III & IV engines have a serial anti-theft system.  This serial anti-theft system is only defeatable through ECM reprogramming.  You should plan on having the ECM re-flashed when installing this into your transplant vehicle.

Crank Position Sensor Reluctor Wheel Differences

Gen III engines (LS1/LS6/LQ4, & early LS2) have a 24x tooth reluctor wheel. Gen IV engines (LS7/LS3/LS9, & later LS2) use a 58x tooth, which provides more precise crank position data to the ECU needed for many displacement on demand and active fuel management engines.

LS2 engines from 2005 Corvettes and 2005-2006 GTOs and Chevrolet SSRs with engine codes ZJA, ZJB, 5MC, YTA and 6MC all had 24X crank position sensor reluctor wheels. These LS2 engines can be operated with an LS1 ECM and a fuel injection harness from Painless Performance, along with an LS1 Corvette style accelerator pedal and TAC module.LS2 engines in 2006 and later Corvettes were equipped with a 58X crank position sensor reluctor wheel. These engines can be operated with a Painless Performance fuel injection harness, an E-38 ECM and 2006 and later Corvette accelerator pedal.

LS3 engines in 2008 and later Corvettes were equipped with a 58X crank position sensor reluctor wheel. These engines can be operated with a Painless Performance Fuel Injection Harness, an E-38 ECM and 2006 and later Corvette accelerator pedal.

LS7 engines in 2006 and later Corvettes were equipped with a 58X crank position sensor reluctor wheel. These engines can be operated with a Painless Performance fuel injection harness, an E-38 ECM and 2006 and later Corvette accelerator pedal.

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What are the Specs of a 5.3 LS Engine?

The 5.3 liter LS-series engine was offered from 1999-2014 and has a 3.78” bore x 3.62” stroke. The block was offered in both cast-iron and aluminum with aluminum cylinder heads. Camshaft specifications varied depending on the year and RPO code of the engine. Horsepower ranged from 270–320 HP and torque ranged from 315-340 TQ. Depending on the year and RPO as well. The 5.3 liter was offered with or without flex-fuel, active fuel management (AFM), and/or variable valve timing (VVT) throughout its production. Internal components varied as well such as dished or flat top pistons. A JEGS tech specialist can help you with further details if you can provide the 8^th digit of the VIN number the vehicle the engine belongs to or the RPO code (example, “LM7”), as well as the year of the engine.

How to Rebuild GM LS-Series Engines

LS engine differences in rebuilding steps vary depending on the engine year, size, engine RPO code or vehicle 8^th digit VIN. Be sure to confirm this information for your engine. However, the general rebuilding process is the same. The first step is the removal of the engine from the vehicle and mounting it on an engine stand for easier accessibility. Next is the removal of all of the components from the outside. Remove all of the covers, fittings, intake manifold, ignition, fuel system components, exhaust manifolds, belt-driven accessories and brackets, and anything else on the engine. Next, remove the cylinder heads after removing the rocker arms and pushrods. Finally, remove the internal components; noting the cylinder # each one belongs to and noting the orientation of parts. The engine should now be stripped down to the bare block. It is highly recommended to take the block and disassembled heads (remove the valves, springs, and components) to a machine shop for inspection and to perform any necessary machine work required for a proper rebuild. All of the internal components should be inspected and/or replaced at this time. In addition, prepare for the rebuild by obtaining parts such as a gasket kit, oil pump, bearings, and any replacement or upgraded aftermarket components. A JEGS tech specialist can help you find the correct parts you need. Also, locate correct and thorough rebuild instructions for your specific engine. Once the block and cylinder heads have been inspected and prepared, reassembly can begin. Reassembly is, for the most part, the reversal of disassembly. Care must be involved in making sure everything is assembled to correct torque and clearance specifications from the instructions you are using to avoid damage or failure of engine components. Once the engine is reassembled, it can be reinstalled into the vehicle. Finally, a proper start-up and “break-in” period should be followed per instructions.

LS Engine Torque Specs

Below are the torque specs for most LS engines. However, always confirm for your engine's torque specifications using the repair or shop manual for your specific year, make, and model.

Part ---- Foot / Inch Pounds Of Torque

Air Injection Reaction (AIR) Pipe-to-Exhaust Manifold Bolts LS1/LS6 15 ft. lbs.

Camshaft Retainer Bolts Hex Head 18 ft. lbs. / Torx head 11 ft. lbs.

Camshaft Sensor Bolt LS1/LS6 18 ft. lbs. / LS2 106 inch lbs. / LS3 80 inch lbs. / LS7 89 inch lbs.

Camshaft Sprocket Bolts LS1/LS6 26 ft. lbs. / LS2 18 ft. lbs. / LS7 22 ft. lbs.

Camshaft Sprocket to Camshaft Retainer Bolt (L98, LS3, L76, L77) First Pass 55 ft. lbs.

Camshaft Sprocket to Camshaft Retainer Bolt (L98, LS3, L76, L77) Second Pass +50 degrees

Connecting Rod Bolts - (First Pass) LS1/LS2/LS6 15 ft. lbs.

Connecting Rod Bolts - (Final Pass) LS1/LS2/LS6 +85 degrees

Coolant Temperature Gauge Sensor LS1/LS2/LS3/LS6/LS7 15 ft. lbs.

Crankshaft Balancer Bolt (Step 1 Pass-to Ensure the Balancer Completely Installed) LS1/LS2/LS6 240 ft. lbs.

Crankshaft Balancer Bolt (Step 2 Pass-Install a NEW Bolt After Install Pass & Tighten as Described in the First and Final Passes) LS1/LS2/LS6 37 ft. lbs.

Crankshaft Balancer Bolt (Step 3 Final Pass) LS1/LS2/LS6 +140 degrees

Crankshaft Balancer Bolt (Step 1 Pass-to Ensure the Balancer is Completely Installed) LS3 110 ft. lbs.

Crankshaft Balancer Bolt (Step 2 Pass) LS3 Loosen 360 degrees

Crankshaft Balancer Bolt (Step 3 Pass) LS3 59 ft. lbs.

Crankshaft Balancer Bolt (Step 4 Final Pass bolt with flanged head) LS3 +125 degrees

Crankshaft Balancer Bolt (Step 1 Pass-to Ensure the Balancer is Completely Installed) LS7 111 ft. lbs.

Crankshaft Balancer Bolt (Step 2 Pass) LS7 Loosen 360 degrees

Crankshaft Balancer Bolt (Step 3 Pass) LS7 59 ft. lbs.

Crankshaft Balancer Bolt (Step 4 Final Pass) LS7 +200 degrees

Crankshaft Bearing Cap Bolts (Inner Bolts-First Pass in Sequence) LS1/LS6 15 ft. lbs.

Crankshaft Bearing Cap Bolts (Inner Bolts-Final Pass in Sequence) LS1/LS6 +80 degrees

Crankshaft Bearing Cap Side Bolts LS1/LS3/LS6 18 ft. lbs.

Crankshaft Bearing Cap Studs (Outer Studs-First Pass in Sequence) LS1/LS6 15 ft. lbs.

Crankshaft Bearing Cap Studs (Outer Studs-Final Pass in Sequence) LS1/LS6 +53 degrees

Crankshaft Bearing Cap Bolts (M8 bolts-First Pass in Sequence) LS7 15 ft. lbs.

Crankshaft Bearing Cap Bolts (M8 bolts-Final Pass in Sequence) LS7 22 ft. lbs.

Crankshaft Bearing Cap Bolts (M8 bolts) LS2 18 ft. lbs.

Crankshaft Bearing Cap Bolts (M10 bolts-First Pass in Sequence) LS2/LS7 15 ft. lbs.

Crankshaft Bearing Cap Bolts (M10 bolts-Final Pass in Sequence) LS2/LS7 +80 degrees

Crankshaft Bearing Cap Bolts (M10 studs -First Pass in Sequence) LS2/LS7 15 ft. lbs.

Crankshaft Bearing Cap Bolts (M10 studs -Final Pass in Sequence) LS2/LS7 +51degrees

Crankshaft Bearing Cap To Engine Block Retaining Bolt (10mm -First Pass in Sequence) LS3 15 ft. lbs.

Crankshaft Bearing Cap To Engine Block Retaining Bolt (10mm -Final Pass in Sequence) LS3 +80 degrees

Crankshaft Bearing Cap To Engine Block Retaining Stud (10mm -First Pass in Sequence) LS3 15 ft. lbs.

Crankshaft Bearing Cap To Engine Block Retaining Stud (10mm -Final Pass in Sequence) LS3 +51 degrees

Crankshaft Oil Deflector Nuts LS1/LS2/LS6/LS7 18 ft. lbs./ LS3 89 inch lbs.

Crankshaft Position Sensor Bolt LS1/LS2/LS3/LS6/LS7 18 ft. lbs.

Cylinder Head Bolts (First Pass all M11 Bolts in Sequence - First Design) LS1/LS6 22 ft. lbs.

Cylinder Head Bolts (Second Pass all M11 Bolts in Sequence -First Design) LS1/LS6 +90 degrees

Cylinder Head Bolts (Final Pass all M11 Bolts in Sequence-Excluding the Medium Length Bolts at the Front and Rear of Each

Cylinder Head - First Design) LS1/LS6 +90 degrees

Cylinder Head Bolts (Final Pass M11 Medium Length Bolts at the Front and Rear of Each Cylinder Head in Sequence First Design) LS1/LS6 +50 degrees

Cylinder Head to Engine Block Retaining Bolt (M11-First Pass in sequence) LS3/LS2/LS7/2nd Design LS1/LS6 22 ft. lbs.

Cylinder Head to Engine Block Retaining Bolt (M11-Second Pass in sequence) LS3/LS2/LS7/2nd Design LS1/LS6 +90 degrees

Cylinder Head to Engine Block Retaining Bolt (M11-Third Pass in sequence) LS3/LS2/LS7/2nd Design LS1/LS6 +70 degrees

Cylinder Head Coolant Plug LS1/LS2/LS3/LS6 15 ft. lbs.

Cylinder Head Core Hole Plug LS1/LS6 15 ft. lbs.

Engine Block Coolant Drain Plugs LS1/LS2/LS3/LS6/LS7 44 ft. lbs.

Engine Block Heater LS1/LS2/LS6 30 ft. lbs. / LS3 37 ft. lbs.

Engine Block Oil Gallery Plugs LS1/LS2/LS3/LS6/LS7 44 ft. lbs.

Engine Coolant Air Bleed Pipe Bolts and Studs LS1/LS6 106 inch lbs.

Engine Flywheel Bolts (First Pass) LS1/LS6 15 ft. lbs.

Engine Flywheel Bolts (Second Pass) LS1/LS6 37 ft. lbs.

Engine Flywheel Bolts (Final Pass) LS1/LS6 74 ft. lbs.

Engine Front Cover Bolts LS1/LS6/LS7 18 ft. lbs.

Engine Rear Cover Bolts LS1/LS6 22 ft. lbs.

Engine Service Lift Bracket M10 Bolts LS1/LS6 37 ft. lbs.

Engine Service Lift Bracket M8 Bolt LS1/LS6 18 ft. lbs.

Engine Valley Cover Bolts LS1/LS6 18 ft. lbs.

Engine Wire Harness Ground Strap Bolt LS1/LS6 24 ft. lbs.

Exhaust Manifold Bolts (First Pass) LS1/LS2/LS3/LS6/LS7 11 ft. lbs.

Exhaust Manifold Bolts (Final Pass) LS1/LS6 18 ft. lbs. / LS2/LS3/LS7 15 ft. lbs.

Exhaust Manifold Heat Shield Bolts LS1/LS2/LS6 80 inch lbs./ LS3 89 inch lbs.

Fuel Injection Fuel Rail Bolts LS1/LS2/LS3/LS6/LS7 89 inch lbs.

Generator Bracket Bolts LS1/LS6 37 ft. lbs.

Ignition Coil-to-Bracket Bolts LS1/LS6 106 inch lbs. / LS2/LS3/LS7 89 inch lbs.

Ignition Coil Bracket-to-Valve Rocker Arm Cover Bolts LS1//LS2/LS3/LS6/LS7 106 inch lbs.

Intake Manifold Bolts (First Pass in Sequence start in middle crisscross out) LS1/LS2/LS3/LS6/LS7 44 inch lbs.

Intake Manifold Bolts (Final Pass in middle-out crisscross Sequence) LS1/LS2/LS3/LS6/LS7 89 inch lbs.

Knock Sensors LS1/LS6 15 ft. lbs./LS2/LS3/LS7 18 ft. lbs.

Oil Filter LS1/LS2/LS6/LS7 22 ft. lbs. / LS3 3/4 to 1 full turn after gasket touches mount flange

Oil Filter Fitting LS1/LS2/LS6/LS7 40 ft. lbs. / LS3 41 ft. lbs.

Oil Level Indicator Tube Bolt LS1/LS6 12 ft. lbs. / LS2/LS3 18 ft. lbs.

Oil Level Sensor LS1/LS6 115 inch lbs./ LS2/LS3 15 ft. lbs.

Oil Pan Baffle Bolts LS3 106 inch lbs.

Oil Pan Closeout Cover Bolt (Left Side) LS1/LS6 106 inch lbs./ LS2/LS7 80 inch lbs.

Oil Pan Closeout Cover Bolt (Right Side) LS1/LS6 106 inch lbs./ LS2/LS7 80 inch lbs.

Oil Pan Cover Bolts LS1/LS2/LS3/LS6 106 inch lbs.

Oil Pan Drain Plug LS1/LS2/LS3/LS6/LS7 18 ft. lbs.

Oil Pan M8 Bolts (Oil Pan-to-Engine Block and Oil Pan-to-Front Cover) LS1/LS2/LS6/LS7 18 ft. lbs.

Oil Pan M6 Bolts (Oil Pan-to-Rear Cover) LS1/LS2/LS3/LS6/LS7 106 inch lbs.

Oil Pressure Sensor LS1/LS2/LS3/LS6/LS7 26 ft. lbs.

Oil Pump-to-Engine Block Bolts LS1/LS2/LS3/LS6/LS7 18 ft. lbs.

Oil Pump Cover Bolts LS1/LS2/LS3/LS6 106 inch lbs. / LS7 89 inch lbs.

Oil Pump Relief Valve Plug LS1/LS2/LS6 106 inch lbs. / LS3/LS7 124 inch lbs.

Oil Pump Screen Nuts LS1/LS2/LS6 18 ft. lbs./ LS3 89 inch lbs.

Oil Pump Screen-to-Oil Pump Bolt LS1/LS2/LS6 106 inch lbs. /LS3 80 ft. lbs.

Power Steering Pump Bolts LS1/LS6 18 ft. lbs.

Spark Plugs (Cylinder Heads-Brand New Engine) LS1/LS3/LS6/LS7 15 ft. lbs.

Spark Plugs (all Subsequent Installations/replacement spark plugs) LS1/LS2/LS3/LS6 11 ft. lbs.

Throttle Body Bolts LS1/LS6 106 inch lbs. / LS2/LS3/LS7 89 inch lbs.

Thermostat Housing to Water pump retaining bolt LS3 11 ft. lbs.

Timing Chain Guide Bolts LS1/LS6 26 ft. lbs.

Timing Chain Tensioner to engine block retaining Bolt LS3 18 ft. lbs.

Timing Chain Dampener Bolts LS2/LS7 18 ft. lbs.

Valve Lifter Guide Bolts LS2 89 inch lbs. / LS1/LS3/LS6/LS7 106 inch lbs.

Valve Rocker Arm Bolts LS1/LS2/LS3/LS6/LS7 22 ft. lbs.

Valve Rocker Arm Cover Bolts LS1/LS2/LS3/LS6/LS7 106 inch lbs.

Water Inlet Housing Bolts LS1/LS2/LS6/LS7 11 ft. lbs.

Water Pump Bolts (First Pass) LS1/LS2/LS3/LS6/LS7 11 ft. lbs.

Water Pump Bolts (Final Pass) LS1/LS2/LS3/LS6/LS7 22 ft. lbs.

Water Pump Cover Bolts LS1/LS6 11 ft. lbs.

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