the 2250 uses the same valve as the 2240 and if you creased the valve volume by length you would have to deal with the valve stem, and spring a lighter valve spring and heavier hammer spring could do the same thing by holding the valve open that spit second more and a boss valve could possibly do all that with just a valve replacement you are getting in the world of R&D and all that takes is time and money a video and his way of getting more internal valve capacity starts at 2:30