Those two fellows are my middle and youngest sons. I will ask Shoei and Arai about tall port helmets.
The head flows increase along with valve lift up to around 0.400 inches lift. The old cams I had provided 0.380 net lift. These new cams give 0.400 net lift so they match the head flow better. A narrow cam was recommended by the duration equation in the "Horsepower Chain" book. Narrow cams are also recommended by the Dynomation program. The ladies at WebCam sent me data for four lobe profiles with lifts around 0.400. All were entered into Dynomation and the narrowest profile worked best. It is a #208 grind and I am using them for both intake and exhaust. The standard 1.1 inch diameter tappet buckets will work with these cams. They require a 1.03 inch diameter bucket, minimum.
A lot of effort is going into reducing the rate of torque decay as the RPM's rise above peak torque rpm. The added lift these cams give with a tad more duration promotes cylinder filling at high rpm. The old #813 grind has 244 degrees duration at 0.050 lift and these new ones have 258. Modeling more lift and duration than this seemed to be unproductive or give only marginal power increases. These cams are as big as this motor can use.
The next step is to grind the welds off of the cam gears, push the gears off, push on the adjustable gears, tack weld the stationary parts of the gears to the cams, and send the lifters and cams out to be superpolished.
A lift vs duration table came with the cams so a digital profile can be generated. This is what I will use in Dynomation for future virtual tuning. It gives much more useful data than a ten point description based on duration at 0.006, duration at 0.050, and maximum lift.