Ok I just got it 2day 6.0HO and 4L60E, well supposed to be a 6.0 HO from an 2004 Escalade. It does has 60L stamped on the back and also the numbers 12551364 and on the heads 317 and 0131200111822319, 1311x8302363. Do anybody know what these numbers mean? How do i find out if its and High Output 6.0??? Couldn't jack the engine up because i didn't have the right chains, do i use the holes on the heads (are they 18mm)? Where do i put the chains on the front of the engine, whats the best way to raise this baby up? Any advice for putting this in my 1968 suburban?

 

the tranny should be a 65e not 60. Pull the spark plugs and take a look and see if you have flat top pistons