Does anyone know the minimum cross-section area of the intake ports on the Chapman Stage VI heads? I'm looking at both the 260cc and 285cc (max wedge) versions, but I'm not sure which will better suit my goals. I'm in the planning stages of a 512 that I want to make peak power around 6500. If the 260 port has sufficient area to not be a restriction at that RPM, then I'll run the smaller port to keep velocity high.