Slightly disappointed in performance

DSMRossi said
Pretty much. Great low end grunt, but runs out of steam up top. They’re great flowing heads, I feel I’m probably not utilizing them with my current grind. I’ll most likely step up one if not 2 of the voodoo line

Do you have any numbers on the heads ?and what's the port volume.
I'd lose the 1.6 and stick to a 1.5 and a better matched cam.