I agree, you do run into issues with shrouding with larger valves, but most shops hit the chamber with a cutter to unshroud it when they cut the seats for bigger valves(if they are looking out for your best interests), or at least will mention it to you that it needs to be done. It does have the potential to take you to a much higher level of performance, for not a lot of extra money by going to 1.94" and beyond. Most shops also can enlarge the bowl area as well to enhance the flow and maximize the benefits of installing larger valves at the same time they are doing the valve job, so you can sometimes kill two birds with one stone by combining this in one operation. Shops that still use stones to grind the seats might have more difficulty in performing these techniques, but can still be done if the shop is willing to take the time to do it.
