I certainly don't know everything but I'll take a shot at it. I went through this recently with my 6.2. There are going to be fill in the blanks here . But
the short answer is yes you can use them. However if they are the angled heads then you will have to bend the inj lins alot and they will damn near touch the turbo side manifold. If it's a DB2 equipped truck you can just use 6.2 lines.
As far as the 162 casting, that doesn't mean boo as I found out. That casting number covers a wide variety of heads and valve configurations.
I found this out the hard way when trying to match a head for my 6.2
It really doesnt matter which heads you use as long as they match.
As far as precups the diamonds are the latest turbo cups. I run 3 dot 6.2 ones with a turbo. No issue. I had a long talk with Bill Heath about precup and he seems to think people put way too much into believing that one kind has a more dramatic effect over another. You can swap them yourself but make sure you put a straight edge on the head. They should not stick up or be recessed more than .002.
as far as sleeving the passages that is a repair for cracked heads. My head guy showed me the kit. I would not do it if there is nothing wrong with the heads. they all crack sooner or later on the 6.5's and most of the time don't effect the engine. I don't think I have pulled a 6.5 apart yet that wasn't cracked. 6.2's tend not to crack as easy because less heat from lack of turbo. If you had no problems with your 6.5 heads use them.
just my .02
Like I said, I left some blanks here. This knowledge was attained whilst on the hunt for a matching 6.2 head for my CUCV after I ...oops...with a 5 lb hammer.
As far as ARP studs, I love 'em but make SURE you clean them well and use a good sealan on the threads. I am sure there is alot of different opinions on what to use. Personally I have had the best luck using Aviation Permatex.
I saw a guy o ring the bolt holes. If the heads are off...not a bad idea.
1886 M1008 CUCV
GM4 Turbo,DB24911 turned up.
Raptor 100 lp.
NV4500(the way they should have come)
5 inch Redneckmaster Ex
Autometer Fullsweeps
Serp Belt conversion. HO WP. Dmax Fan
Previuosly owned:
2000 K3500 6.5TD
1993 K3500 6.5TD
1983 K5 6.2
1998 GMC Suburban 2500 6.5TD
1991 GMC Jimmy 6.2
1989 GMC Vandura 2500 Hi Top 6.2
1983 GMC K2500 6.2
1999 Ford Suerduty 350 7.3PS
1983 Ford E-350 6.9
1982 VW Rabbit Diesel