ss4chad

iTrader: (19)

My '13 Sierra LTZ with a 5.3, what is that motor called? L88, Q93, ??????? Something else?

Thanks
Chad

MikeGyver

iTrader: (5)

What is your VIN? Use it to look up your engine

1994Vmax

iTrader: (4)

Look in your glovebox at the sticker with a bunch of 3 digit codes. It will start with the letter L and probably is an LC9. All that code is for is identification when they are building the truck and of course can be used for parts I'd after. The code itself is called a Regular Production Order code or RPO for short.

An LC9 as example is an aluminum block Gen iv 5.3 which in this case will be equipped with VVT and AFM. The older LC9s carry the same code but do not have VVT.... Gm is fun like that and recycles codes lol. The early LC9 through 2009 was 9.9:1 compression but the later one through 2013 is only 9.6:1 due to the valve reliefs in the pistons accommodating the VVT. What matters... it's an aluminum block 5.tree lol. It also will have 799 casting heads (or possibly 243 although all the late ones seem to be 799) the same as every other 4.8 and 5.3 gen iv engine has.

It also could be an LMG in 2013 which is the same engine overall but with a cast iron block instead of aluminum.

Gm contradicts themselves a lot on things like compression as a sales manual from 2013 still says 9.9:1 compression but that's incorrect as the flat top pistons the earlier engines had got notches cut in them lol. The magic compression ferry didn't change the head gasket thickness or the chamber volume lol. Its just a cut and paste error on the brochures part.

01FormulaTA

iTrader: (16)

if its 2wd LMG (Iron Block), 4wd then LC9 (Aluminum Block)

ss4chad

iTrader: (19)

Its a 2WD and to be honest I haven't looked at the motor to see if it's aluminum or iron. Just changed the plugs and wires last week and didn't pay attention.

Chad

1994Vmax

iTrader: (4)

Still can either or. The above statement about the 2wd/4wd availability thing isn't correct either. 2wd trucks with the XFE package are the aluminum block 5.3 as well.

RB04Av

GM uses RPO (Regular Production Option) codes that start with L for the engine.

Look at your SPID (Service Parts ID, I think that stands for) label, which has all the RPO codes for every option installed on your vehicle. Whichever one starts with L, that's the engine you have. Probably permanently inviolately and irrevocably associated with your vehicle, never to be possible for it to be exchanged with any other vehicle, on the glove box door.

swathdiver

LMG or VIN Zero. LC9 or VIN 7

ss4chad

iTrader: (19)

It's an Iron Block, I seen the rusty block yesterday while I was checking the oil level. So I got an LMG, what does that stand for? Anything at all or just letters.

Chad