I just got an aluminum gen 4 5.3 but has 24x wheel. They said it came out of buick Rainer. It's got 799 heads and flat top pistons. Definitely got 24x wheel. Timing chain cover cam sensor. Side knock sensors. I think I'll have to double check on cam gear. Is this normal

 

brain fart. had the wrong wiki tab open.

thx G.

 

Many early Gen IV 5.3/6.0 came in either 24T or 58T (LH6, LS4, LS2). Yours is the early LH6.
The L33 was Gen III but did not come in the Rainier. Pickups only.
The smaller SUV family got aluminum Gen IV V8's, no Gen III.