5.7 balance internal or external ????

im sure this has been asked before 312 times , but im asking it again . is the 2006 5.7 hemi internal or externaly balanced ? the reason im asking is because i removed the crank pulley and noticed its not keyed at all . so on re assembly we just install it with no oreintation? i see the pully has balance holes drilled in it , maybe for just balancing the pulley ? if any one knows the please let me know, thanks ed (aka dartman 440) :banghead: