A couple time savers for me is after I set my pinch dimensions (on my head rotator) to give me more room to work the port I move on to the common wall and port to the tube. This all gives me better visual and max room. I then flip the head roof side down to raise the roof before I touch the floor. Through experience and testing I have a snap gauge that I use to set the roof dimensions where I want it. Keep this dimension handy as I use it on every valve size from 2.02-2.08. At this point I can work the floor some but I do my finish floor work after I have the head off my rotator. Take a set of 4-6 inch calipers and with the head on its end measure up through the valve seat and measure from the head deck to the top of the shortside. Keep notes of these measurements as you do your flow tests. I have a different height for each valve size and again have this number written down. I wish I could give you that dimension for the different valves sizes but I have 100’s of hours of porting and testing to get that number. My set I’m working for that hopefully will soon get on my duster are flowing 334cfm so far and have a totally different dimension. I didn’t reread this as I have some running to do so I hope it makes sense.