I don't think I've ever seen an aluminum 5.7L Hemi block. They all have aluminum heads. The only aluminum Mopar blocks available are an oversize 426ci block and a 6.1L block. The 5.7's are iron like the production engines.
Direct from the Mopar catalog:

HEMIŽ, GEN III
BLOCKS
A.
Blocks- Aluminum
Hemi Gen III Aluminum Blocks are 100 pounds lighter than 6.1L production cast
iron blocks! They are designed to accommodate all parts from a 6.1L Hemi Gen III
engine.

P5155507
Block, Aluminum, 426 Hemi, Gen III, Bored at 4.125", Can
Be Bored Up to 4.155"
1
P5153897
Block, Aluminum, 6.1L Hemi, Finished Bored at 4.055"
1
P5153898
Block, Aluminum, 6.1L Hemi, Semi-Finished Bored at 4.114".
Can be Bored Up to 4.185

Take some pictures and open a free photobucket account if you don't already have one, and post the links here.

 

yea I looked that up and seen that to so I could be wrong but the block looks identical to the heads and upper a-arms which are aluminum. I also have a friend who's a mechanic that said the block was aluminum.

 

when I get a chance tomorrow while im painting the new bumper cover I'll try and take a pic of the motor and put on here

 

Sounds good.
Mine came painted black from the factory.

 

[IMG]<a href="http://s80.photobucket.com/user/tony_wchs/media/IMG_20130518_124405_975.jpg.html" target="_blank"><img src="http://i80.photobucket.com/albums/j167/tony_wchs/IMG_20130518_124405_975.jpg" border="0" alt=" photo IMG_20130518_124405_975.jpg"/></a>[/IMG]

 

 

Looks like a stock block to me...Iron.
Are you sure your not looking at the head itself and not the covers?

 

Looks like a complete stocker. Maybe looking at the front cover and thinking it's the block?