What Engine Year - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Chris50 · 11-30-2019, 07:37 PM

Hope all is doing well. To thank everyone for this site, as I have used it for years as a valuable resource.
I have spent many hours researching on this forum and others trying to get the year of the LS engine I've recently purchased. I know the full vehicle VIN is in the PCM but haven't sent it out to get it flashed, but I'd like to order gasket kit and other parts. Based on my research, I believe it's between a 99 and 03 (truck intake, red/blue connectors, engine stamp 12551358, 5.3L etc.). On the flat tab to the rear of the engine, I have located the etched derivative vin, serial number or whatever it's called. The etched digits are CYG163213. Can these digits be used to determine exact year?

prodjay10 · 12-01-2019, 01:14 AM

If you have an engine harness ready you can wire it up to the ecm and with some power at the right wires you should be able to scan it and get the vin.

I did this after starting it up because it ran bad at first. I wanted to make sure the motor was decent enough before I started throwing gaskets at it.

**mongocanfly** · 12-01-2019, 01:20 AM

Is there a date code cast on the pass side front of block ?
Will look like this..

**mongocanfly** · 12-01-2019, 01:47 AM

Copied this from another site...

On the front right hand side on the block is a cast date code and it deciphers as follows:
First Letter: Month
A=Jan E=May J=Sep
B= Feb F=Jun K=Oct
C=Mar G=Jul L=Nov
D=Apr H=Aug M=Dec

Next numbers: Day of the month: example "27" , is 27th day of the month
Last number: Last digit of the year example 9=1999

So the block picture below shows the block was cast on Nov, 27, 1999. The circle of dots and the arrow is basically a crude time stamp and will have either a "D" for dayshift or "N" for night shift.

Chris50 · 12-01-2019, 12:05 PM

I will look for the date code. Thanks for the replies

**Gregski** · 12-01-2019, 01:34 PM

this may help narrow it down further, does it have EGR if it has the ugly holes in the exhaust manifolds it's a 1999-2001 same goes for the intake manifold if it has that large golf ball hole on the passenger side of the intake manifold it is a 1999-20001, the factory done away with EGR in 2002

11-30-2019, 07:37 PM	#1
Chris50 Registered User Join Date: Dec 2012 Location: Western Kentucky Posts: 8	What Engine Year Hope all is doing well. To thank everyone for this site, as I have used it for years as a valuable resource. I have spent many hours researching on this forum and others trying to get the year of the LS engine I've recently purchased. I know the full vehicle VIN is in the PCM but haven't sent it out to get it flashed, but I'd like to order gasket kit and other parts. Based on my research, I believe it's between a 99 and 03 (truck intake, red/blue connectors, engine stamp 12551358, 5.3L etc.). On the flat tab to the rear of the engine, I have located the etched derivative vin, serial number or whatever it's called. The etched digits are CYG163213. Can these digits be used to determine exact year?

12-01-2019, 01:14 AM	#2
prodjay10 Registered User Join Date: Jun 2016 Location: Phoenix AZ Posts: 429	Re: What Engine Year If you have an engine harness ready you can wire it up to the ecm and with some power at the right wires you should be able to scan it and get the vin. I did this after starting it up because it ran bad at first. I wanted to make sure the motor was decent enough before I started throwing gaskets at it.

12-01-2019, 01:20 AM	#3
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,670	Re: What Engine Year Is there a date code cast on the pass side front of block ? Will look like this.. Attached Images __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver

12-01-2019, 01:47 AM	#4
mongocanfly Post Whore Join Date: May 2015 Location: Alabama Posts: 14,670	Re: What Engine Year Copied this from another site... On the front right hand side on the block is a cast date code and it deciphers as follows: First Letter: Month A=Jan E=May J=Sep B= Feb F=Jun K=Oct C=Mar G=Jul L=Nov D=Apr H=Aug M=Dec Next numbers: Day of the month: example "27" , is 27th day of the month Last number: Last digit of the year example 9=1999 So the block picture below shows the block was cast on Nov, 27, 1999. The circle of dots and the arrow is basically a crude time stamp and will have either a "D" for dayshift or "N" for night shift. __________________ Mongo...aka Greg RIP Dad RIP Jesse 1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598 Mongos AD- LS3 TR6060...http://67-72chevytrucks.com/vboard/s...34#post8522334 Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563 2023 Chevy Z71..daily driver

12-01-2019, 12:05 PM	#5
Chris50 Registered User Join Date: Dec 2012 Location: Western Kentucky Posts: 8	Re: What Engine Year I will look for the date code. Thanks for the replies

12-01-2019, 01:34 PM	#6
Gregski Post Whore Join Date: Aug 2014 Location: Sacramento, CA Posts: 10,868	Re: What Engine Year this may help narrow it down further, does it have EGR if it has the ugly holes in the exhaust manifolds it's a 1999-2001 same goes for the intake manifold if it has that large golf ball hole on the passenger side of the intake manifold it is a 1999-20001, the factory done away with EGR in 2002 Attached Images



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