New guy looking to Identify LS

[Black_rado]

Got this Jimmys Chassis buggy last year and still have not met anyone in person that can show me on paper what this motor is. Truck intake, Aluminum block, VIN# is 3GNEC16T61G148470. Not sure that the computer and motor are from the same vehicle. VIN states an iron block, when its clearly not iron. I cannot find a 6.0, 5.7, or 5.3 stamp on either end of the motor. Visually its an LM4 or L33, but it has 862 heads with neither of those came with. Any help is appreciated!! Thanks

[Samckitt]

If the size is not cast in the back of the block, then i wonder if it is either a 4.8L or 5.3L because they have the same bore.

Here is example of size cast into the block.
https://static1.pt-content.com/images/pt/2022/07/LS12-1.jpg

https://static1.pt-content.com/images/pt/2022/07/GM_ls_vortec_block_rear_face-1.jpg

[Black_rado]

A 5.3 is what most people have told me. Can any of those numbers be used to identify it? Is there a database anywhere that would have that?

[Samckitt]

The only thing I can find is that the 862 are 5.3L heads.

[TomMLS1]

In the picture above, the 8 digit number on the left, right at the edge of the cylinder block is as close as you are going to get. At least it will tell you what it left the factory as. It could have been bored, stroked and run a litany of cylinder heads.

T,

[Black_rado]

Makes sense. The closest I come to is a LM4, except my throttle is cable instead of Drive-by-Wire. But like you said, it could have been all kinds of modified. Thanks

[raustinss]

Take the vin to a gm dealer ... that should be enough for them to tell you what it came from

[Samckitt]

Take the vin to a gm dealer ... that should be enough for them to tell you what it came from

VIN? As in the car VIN? I tried looking up the numbers in a VIN search tool but it says a VIN is 17 numbers, the longest one pictured is 16.

[Black_rado]

Vin is 3GNEC16T61G148470. The motor that came stock in that VIN is an iron block. Mine is defiantly aluminum. T = Gen 3 LM7 Iron Block.

[andrewb70]

Vin is 3GNEC16T61G148470. The motor that came stock in that VIN is an iron block. Mine is defiantly aluminum. T = Gen 3 LM7 Iron Block.

What is it that you are ultimately trying to figure out?

Where are the knock sensors on this engine?

Andrew

[ryeguy2006a]

See if you can sneak a camera onto the passenger side of the engine block next to the timing cover. It should be located there, but may be hard to see if there is an engine accessory bolted to it. I'll bet with a flashlight you could see it. The

[TUBED]

If you have an aluminum block 5.3 for sure ..... it's probably a 2003 or 2004 from a Trailblazer as they came factory with 862 heads, knock sensors in the valley and a 3 bolt style drive by wire throttle body. Though you have a cable throttle body on your rig the bolt pattern is the same for both I believe. If you have the oil pan off look at the rods as the Gen 3 style came in these motors. The 2005 & up aluminum 5.3 had Gen 4 floating rods, 799 heads, Trailblazer SS intake with a 4 bolt drive by wire TB, knock sensors will on the side of the block back behind the motor mounts, and the cam sensor will be on the front timing cover. The aluminum Gen 3 & Gen 4 5.3's in the year models mentioned are 24x & cathedral port motors. Hope this helps.

[Black_rado]

If you have an aluminum block 5.3 for sure ..... it's probably a 2003 or 2004 from a Trailblazer as they came factory with 862 heads, knock sensors in the valley and a 3 bolt style drive by wire throttle body. Though you have a cable throttle body on your rig the bolt pattern is the same for both I believe. If you have the oil pan off look at the rods as the Gen 3 style came in these motors. The 2005 & up aluminum 5.3 had Gen 4 floating rods, 799 heads, Trailblazer SS intake with a 4 bolt drive by wire TB, knock sensors will on the side of the block back behind the motor mounts, and the cam sensor will be on the front timing cover. The aluminum Gen 3 & Gen 4 5.3's in the year models mentioned are 24x & cathedral port motors. Hope this helps.

Great Info! The throttle body has 3 bolts. I smashed the oil pan so ill check the rods when I change it out. Here is the number on the side of the block, which those first 2 Letter/Digits are not making sense.

[TUBED]

Great Info! The throttle body has 3 bolts. I smashed the oil pan so ill check the rods when I change it out. Here is the number on the side of the block, which those first 2 Letter/Digits are not making sense.

The partial VIN on the block starts with the 9TH digit as 10th digit is the second number being 4 tells you that the year model is 2004.... if these are indeed the numbers on the back of the block . The VIN from the computer being used is from a 2001 GM 1500 truck with a 5.3, here's the breakdown of the VIN digits you provided : the 6th digit is 1 representing 1500 half ton series truck, the 8th digit is T for a 5.3 motor, and the 10th digit is 1 meaning it's a 2001 year model.
Most likely what you have in your rig is a 2004 Gen 3 5.3 RPO code (LM4) the 8th digit of the VIN would have been P and the elctronics from a 2001 GM truck.

[Black_rado]

The partial VIN on the block starts with the 9TH digit as 10th digit is the second number being 4 tells you that the year model is 2004.... if these are indeed the numbers on the back of the block . The VIN from the computer being used is from a 2001 GM 1500 truck with a 5.3, here's the breakdown of the VIN digits you provided : the 6th digit is 1 representing 1500 half ton series truck, the 8th digit is T for a 5.3 motor, and the 10th digit is 1 meaning it's a 2001 year model.
Most likely what you have in your rig is a 2004 Gen 3 5.3 RPO code (LM4) the 8th digit of the VIN would have been P and the elctronics from a 2001 GM truck.

Awesome! Thanks for your help! Appreciate it! (Needs to be 50 characters)