Well I do agree that it can but it's not always the case; In this case (and I'm speaking mainly to 440 Mopar standard port window wedges) the motors are already relatively under-ported (cross sectional area to Swept Volume) so I have increased port volume substantially without any measureable impact on low end performance. If we were talking about a larger port motor (such as a Hemi or a 351 cleveland) what you state would certainly apply.

While it's true anytime you increase the port volume you can have a negative (slowing) effect on the port velocity, often times that can be offset by 'sharpening' the Valvejob (valve and seat angles)itself. Also there are cases where removing material/adding CC volume can actually enhance velocity at nearly EVERY measurement point inthe valve lift. Bowl blending (removing factory ridges) and 'boat tailing' the guide areas are examples of where it can often be a win-win.

good point, which deserves some further clarification.