Before you begin your engine project, you need to know exactly what you have—and when it comes to General Motors’ Gen 5 LT small blocks, it’s currently a lot easier (especially with car engines) than it is to identify GM Gen 3 and Gen 4 LS small blocks.
How Do I Know Which LT Engine I Have?
There are currently just five LT engines, including the LT-based EcoTec3 truck engines: LT1, LT4, L83, L8B, and L86.
Much like with LS engines, the easiest way to be sure which LT engine you have is to check the 8th digit of the Vehicle Identification Number (VIN).
Consult these tables to identify your LT engine by VIN.
[NOTE: Take care not to confuse the letter “B” and the number “8″]
LT (Gen 5) Car Engines
| 8th Digit of VIN | RPO Code | Displacement | Common Name |
|---|---|---|---|
| 7 | LT1 | 6.2L | LT1 |
| 6 | LT4 | 6.2L | LT4 (supercharged) |
EcoTec3 Truck Engines
| 8th Digit of VIN | RPO Code | Displacement | Common Name |
|---|---|---|---|
| C | L83 | 5.3L | EcoTec3 5.3L |
| R | L8B | 5.3L | EcoTec3 5.3L (with eAssist) |
| J | L86 | 6.2L | EcoTec3 6.2L |
How do you verify visually that someone didn’t put a 5.3 in a truck that is supposed to have a l86? I bought a 2015 sierra denali which says it has a 6.2 but I know the engine was warranty replaced at some point and I want to make sure it has the correct engine. It doesn’t have the power I believe it should.
Anybody know about it? Does it has differneces in visual ?
Check the casting number of the cylinder head which is located just between the valve cover and the exhaust manifold on the passenger side on the side of the cylinder head. Should read 12685669.
I have a 2019 AT4 GMC Sierra. My 8th digit is L. What the heck???
I think the 2019+ 6.2 truck engine is known as the L87. Which is newer than this article.
where can i find the nerf bars/side steps for my 2000 Chevy silverado 2500HD crew cab pickup? i have looked everywhere. the center to center body mount bolts front to rear span is 85 inches with one in the middle. everything that has been sent to me is C to C is 75 inches.VIN 1GCGC23R7YF404896. IS IT A CREW CAB OR EXTENDED CAB? 4 full size doors. no dealer can helpme nor any online companies.i just can’t find the right size HELP!
Hey Ralph, it looks like you may have some options. Go Rhino offers a set for the 2000 C2500 crew cab, according to their website. N-Fab and Westin do as well, again, according to their respective websites.
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But to make sure, you may want to talk to those folks directly, as there are different bed and cab configurations to consider. Thanks for reading, and good luck with your search!
The number on the back of my engine block on the driver rear side is 1P*6FR150697 what year is my engine. Was told it was a 2016.
On my Chevy Silverado the 8th digit is a G , what does this mean thanks
ok so what is a LT2 then
i see that Vortec= LS and Echo = LT; well the 8th letter in my vin is a C which means its a LT but the moter is a Vortec meaning LS so which one is it
If your vehicle is a Gen 5, and your 8th digit is a C, you have an L83. Naming convention between LS/LT/Vortec does not matter once you have the RPO.
My 2001 Chevy Silverado 1500 crew cab, 8th digit of VIN # is a “T”. I don’t see that having an explanation? Can someone please help me? I just want to know what model I have so I can get a part and order it. Thank you
L8B WHAT POWER DOES IT HAVE AND IS IT A DECENT ENGINE
1GCGK29U11Z285797
Base – LS – LT ?
Apparently they truncated the tables:
https://www.onallcylinders.com/2017/10/26/how-to-identify-an-ls-engine/
Did you mean for the Gen. III/IV LS family? This article is for the Gen. V LT series.
High I have 04 Chevy Silverado just trying to figure out what size of motor is in the original owner says it’s the ss model ls the 8 digit in the bin is a v?
I have a 2019 Silverado LT. 2wd. The 8th digit in the Vin is D. What engine is that?
My 8th digit is a 0 ( 2009 Tahoe LT 5.3 )
My 2010 chevy silverado Vin num, eigth is( 0 )how I know what specific engine I have? I need help to order Parts ( timing part ).
My 8th digit in my VIN number is f can somebody tell me if that is a l82 l83 or l84 I know it is a 5-3 is there any information anyone can tell me
I have a 1994chevy 1500 with a V8 what letter denotes a 350 cid
Idk if my 2017 Camaro is LS or LT or RS ?
1G1FB1RS1H0212201 (vin #)
Let me know …
2011 GMC Sierra Z71 aluminum block #799 head stamp. What is this a L33 or LQ9
My 8th letter of my vin is U. So what is mine? LT or LS?
My eight letter is also a u what do I have for an engine
kplucyrita62@gmail.com
I guess my LT-5 in my 91 ZR1 has no vin number?
Hello Dan, this guide is for the Gen. 5 LT motor series that came after the LT-era SBCs in your Vette. The Gen 5 LT series discussed here arrived in the early 2010s to replace the LS Series engines.
I have an Lt engine in a street rod there for I don’t have a vin number and now I am really confused. How can I identify what Lt engine it may be? I was told it is a LT1 but I can’t be sure it don’t look like any pictures I have seen. Thanks.
Are you sure it’s a Gen 5 LT? The LT designation has been used by GM a handful of times as far back as the original LT-1 in the early 1970s–that particular engine was based on traditional small block Chevy architecture. Then the LT1 (no dash) name resurfaced in the 1990s as the final evolution of that aforementioned small block, only with some improvements–notably reverse cooling and the Optispark ignition.
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Then the LT designation resurfaced again in the early 2010s as new naming convention for the nascent Gen. 5 Chevy Small Block family, which was derived from (and subsequently replaced) the LS series.
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This article is for the modern, latest iteration of the LT engine family that arrived around 2013. Does that clear things up?
I have 2021 gmc 1500 8th letter in vin is a d what engine do I have
8th digit is a u what size engine how much horsepower do I have
I have a 2000 Chevy Silverado 4×4 1500 V6 engine. It was stolen and I just bought it from the car lot at Twin Rivers in Beatrice, Ne. Please tell me what I can do to recover my truck. I need it to support my family and to have work.