GEP 6.5 date code

[CST]

sorry if this question is elsewhere but there a hundreds of posts to sift thru and i haven't found anything. i'm trying to ID my engine. i think i was told it was a 2006 GEP but not sure. the stampings i found were a 41x and HD on the tranny housing and on the manifold i found an 8 6279. the right valve cover has 12564564. the engine is in an '87 M998. also if anyone knows a part number or something for the belts and where to get a stronger alternator that would be helpful.
matt
sw8_2dg at yahoo

 

[Coug]

numbers for the date code are on the passenger side behind the cylinder head. Can be seen with the doghouse off.

If it's in an older truck with the V-belt system, then it's going to be the same V-belts as the 6.2 it replaced.

"stronger alternator" you'd probably either want to go aftermarket and get a standard 24V alternator, or go with the 200 amp generator system. The aftermarket alternator is by far a MUCH less expensive route (and arguably more reliable) while the 200 amp keeps it all OEM.