so here's the issue i got a gen III with casting# 12551358 and 706 heads. I'm pretty sure its a 5.3 but casting was also used on 4.8s came out of a 00 yukon XL with unknown km in a wrecker got it with a 4l60e 4wd for basically $250 so if any one more knowledgeable then me can figure out and give me a definite answer as to what i have.



head off heard theres a difference in pistons but dont know what the difference is

 

Its a 5.3

4.8s have flat top pistons

Also I don't think any XLs have 4.8s only reg Yukon.

 

okay thanks for the info its going into my pro touring project anyways most of my friends in that circle just buy crate engines and don't know much about anything other then ls1-7s but for $250 for engine and trans i couldn't say no

 

The 5.3L should be fun in a car project, you going to cam it too?

 

Yeah I will it's cam heads headers and mostlikly a blower as well

 

A nice score from by the looks of it, Pick and Pull in the West end of Edmonton. The gravel, A frame, rim stands and little cart makes it a dead give away. LS powered anything at any of those yards ( KarBashers or Pick and Pull) get ripped down to nothing so fast I gave up looking at them, lol.

 

5.3
Nice find BTW!

 

yeah it was picknpull in the west end the yukon was in the middle of row 1 some one ripped the front clip of but left the engine totally untouched it was even me that pulled the intake off of it i set it in the frame of my car for the winter definitely going to need to run a dry sump system i know this isn't a car forum but ill throw some pictures up in a while

 

They had an 03/04 Avalanche that was smashed out along the fence of vehicles yet to be processed or whatever. Would have been a 5.3/ 4L60E as well but I don't know if it ever made it into the yard, or what. Nothing I needed out of it but it was complete at that point. I haven't gone in a while so I might need to make some rounds again, lol. People do the strangest things in that pick and pull yard, makes you wonder what they actually were after sometimes.

 

yeah i got looked at weird for taking an engine and trans out in one piece