TableLeg

Can anybody please help with the following?

I bought a complete 5.3 GenII L33 engine from a guy I know (who is a trusted seller). The engine came from a Silverado 2005.

It has 799 heads and everything else expected of the L33 engine, Alloy block, flat top pistons, block says 5.3L on the front.

My question is what should the engine number be and where would I find it?
I have searched over and over online and all the info seems to point to only a few specific areas where the engine code would be. I have a number of different numbers on various parts of the block. Just can't tie them up to what would be expected to be the engine number.

On the flat section at the rear of the N/S head I have a 'laser etched' code with 1 letter followed by 8 numbers. Txxxxxxxx
Elsewhere I have a 9 digit number code followed by a single number and then 4 more numbers. xxxxxx xxx x xxxx
The block also the code GM 12572733.

Can anybody tell me if any of these would likely be engine number that confirms it is an L33?

If not, what type of format for the code should I be looking for?

86CAMARO400HP

iTrader: (1)

Lm4.

https://www.onallcylinders.com/2018/...ads-cam-specs/


L33

https://www.onallcylinders.com/2018/...ads-cam-specs/

TableLeg

Thanks for the reply.

I had seen that info already, unfortunately I still don't see the info I need. Perhaps you can tell me what the engine number should look like (number or letters and how many)?

I know that the L33 should have a 'B' in the vin. But is that the car Vin or the engine Vin?

Chris97b

iTrader: (1)

The engine doesn't have a separate VIN. 12572733 is an L33 casting.

TableLeg

Thanks for the reply. Do you have any references I could use to confirm the 12572733 number as that from an L33?
I need to prove the engine age if possible so given the L33 was only used in the Silverado from 2005-2007 (I believe that's right) it would be useful if I could prove it on paperwork.

Chris97b

iTrader: (1)

https://www.onallcylinders.com/2018/...ads-cam-specs/

TableLeg

Thanks again for the reply but unfortunately there is no reference to 12572733 on that page.

86CAMARO400HP

iTrader: (1)

The engine block number should be on the block or you will have to look at the cam gear to verify 24x which would be gen 3 either L33 or Lr4

01FormulaTA

iTrader: (20)

the only GEN 3 Aluminum Block 5.3 that came with 799 heads and flat top pistons was the L33....boom confirmed

TableLeg

Yep it has the 24x timing gear as expected for the L33.

TableLeg

Perhaps I should have explained myself a bit better, I am certain that I have an L33. However I need to prove that for registering my car with that engine. I am required to prove the date of manufacture of the engine in order to have emissions testing requirements assigned to the car.

In the past with Ford engines it was as simple as contacting Ford service and they would send out a headed letter stating 'From the information provided, this engine serial no xxxxxx/ part no. xxxxx is the xxxxx engine and was used in the Ford xxxxxx manufactured between years 2005-2007'
That would have been sufficient however this time I am using a Chevrolet engine and sadly NOBODY at Chevrolet will help! Ive tried contacting their customer services and even dealerships.

If anyone has a contact at Chevrolet who help I would be extremely grateful.

TableLeg

Bump.

Can anyone offer a definitive answer to my question or can put me in contact with someone at Chevrolet who could help?

Che70velle

iTrader: (6)

My guess, and this is a guess, would be to go back to who you bought the engine from and have them print you up a receipt with the engine size, and year on it, and what it came out of. Have them state on the receipt that the engine is, in fact, an L33. From the receipt you can prove your case because the L33 was only made for 2-3 years. Maybe even put the VIN number of the truck that the L33 came out of for further proof. That’s likely the best your going to be able to do here.

rubrhammer

iTrader: (5)

The date code should be cast on th block in front of the block in front of the passenger cylinder head surface

TableLeg

Thanks for that. Can you please give me an idea of the format the date is in? Is it one long number (day,month,year)? Or just the year?

I have 110904 followed by some other numbers. I wonder if this is it?
I thought the L33 was years 2005-2007.

G Atsma

The L33 block is likely the same one used for the LM4, the other Gen III aluminum block 5.3L.
You will find different casting numbers for the same engine within the same year sometimes.

rubrhammer

iTrader: (5)

I'm not at home to verify but it will be either number letter number ie: 11 A 4 for Jan 11 2004 or A 11 4.

Derwyn Kirby Bowers

http://www.aerohill.com/chevrolet-53...07-engine.html

CattleAc

iTrader: (7)

If the #110904...is a build date # for your engine, 11-09-04. It would have been installed in a 2005 chassis...

TableLeg

Many thanks,

I guess that confirms what I was told in that it was from a 2005 Silverado.