Does a 2008 Buick lacrosse cx have a cast iron block or aluminum?

[Rally Sport]

I own a 2008 Buick lacrosse cx and I was just wondering if it has a cast iron block or aluminum.

 

[RD_Atlanta]

If the engine is a 3.8L, it has a cast iron block & heads (which is a favorite of many, including me). I understand the 3.6L block and heads are A319 aluminum alloy. I think the 5.3L V8 uses the same aluminum alloy as the 3.6L.

 

[Rally Sport]

Mine has the 3.8 v6.