View Full Version : What the heck did I just buy?


Unholy
08-02-2012, 06:23 PM
Hey all... I just picked up a motor from some kid on CL (claimed to be a 2006). I know its a 5.3 aluminum block, but im not sure of too much more. My question is ... how can I find out what it really is? Is there a way to read the PCM (blue/green connectors with the numbers 2715 P25799) to get engine specifics like VIN and model, mileage etc? If so, can i just hook it to a PC with some type of adapter? Externally, I know that it has 799 casting heads, and thats about it. Oh and did I mention that the entire wiring harness is cut into 30 pieces... uggh. lastly, I remember reading somewhere that they had diferent electric connections on the back side behind the intake... that might be a clue for someone with way more knowledge than I. Here are some pics

Thanks!

theskitztikwon
08-02-2012, 09:56 PM
http://en.m.wikipedia.org/wiki/GM_Vortec_engine
Sounds like you have an l33 or lh6

usnfenix
08-02-2012, 11:52 PM
dont mind me asking but why'd you buy it if you didnt know what it was?

jrob56
08-02-2012, 11:55 PM
my guess is he got a good deal on it, at a certain point I wouldnt ask questions either

Unholy
08-03-2012, 02:30 AM
yep exactly that... the deal was just too good to pass up. I knew it was a 5.3 and aluminum. I know its one of 3 or 4 engines, but there has to be a way to see which one exactly. I still think there has to be someone with the knowledge out there that can just look at it and say... coils are round, bla bla connecter in the x location, thing-a-majig is grey... its an LH6 or LC9.

Meanwhile, does anyone know if I can read data from the PCM? and How?

bww3588
08-03-2012, 03:03 AM
Part of the Vin is etched on one side of the bellhousing flange. Either above the starter location or above the oil filter. I forget which side.

You should be able to cross reference it with that.

Blk98Vert
08-03-2012, 03:41 AM
You have a newer gen 5.3

itsslow98
08-03-2012, 03:47 AM
What did you pay? The heads alone are worth 400.

Unholy
08-03-2012, 01:38 PM
Woot! I paid $500. That's why I didn't sweat the details. Although the kid I bought it from really had no info on the motor other than he said it was from a rolled 4x truck with 28k miles.
I still want to get into the PCM. How can I interface with it without a wiring harness? Does someone sell a connector that hooks to a pc to read data that I can buy. Or is someone in the local SoCal area that owns one that can help out?

I8UR4RD
08-03-2012, 10:35 PM
we got an 07 with heads, harness, everything for $350. :)

107k miles .....roller pitted like you would not believe, lobe was all messed up.

already have the ls6, and springs for it.

pushrods, seals, ring it, and let it eat some boost after some studs on those 799's.

Unholy
08-04-2012, 02:49 AM
After reading about a thousand posts and doing some poking around on the engine, I discovered I have knock sensors in the valley under the intake... based on what I read, that leads me to believe this motor is an L33. Can anyone confirm that to be a good assumption?

raptorblackBird
08-05-2012, 07:09 PM
man....I didn't even know they made an aluminum 5.3!!


Posted from LS1Tech.com App for Android

itsslow98
08-06-2012, 05:37 AM
man....I didn't even know they made an aluminum 5.3!!


Posted from LS1Tech.com App for Android

Dont take my word for it but I believe they were only made after 2008, all years prior to that were iron blocks.

bww3588
08-06-2012, 07:17 AM
Ssr, all v8 trail blazesr and bravada's had aluminum 5.3's. They were made before 08.

ragtopz28
08-06-2012, 09:31 AM
Dont take my word for it but I believe they were only made after 2008, all years prior to that were iron blocks.

5.3 in my 05 GMC Z71 was all aluminum.
See this page:
http://www.ls1fc.com/techinfo/enginegloss.htm