Cylinder heads
Apache is 6.4 SRT8
BGE is identical to apache but better metal and comes on truck 6.4 (and I think on latest SRT8s)
6.1head is just called 6.1 head
5.7 03-08 is called the early 5.7 head
09-now 5.7 is called the eagle head


Engines
03-08 5.7 is early 5.7
09-now 5.7 is called eagle 5.7
6.1 is just called a 6.1
BGE is 14-now truck 6.4
SRT8 6.4 is 11-now Car suv 6.4 (Again I think the SRT8 6.4 has now switched to using BGE block and heads somewhere along the way)

I am not causing global warming, I am just trying to hold off a impending Ice Age!