Docjim, the 781's are great heads, even as they are with that valve size. If you're not going to race it, you wont notice or feel any difference between those valves and 2.19/1.88's or larger. And in the same vein, if you're not racing, the weight loss will not make a difference...but you'll save a lot of money!! (Aluminum is nice, but pricey) The only concern with those heads is the rather large combustion chamber, unless you use a domed piston, your C/R is going to be low....with the stock pistons, it was way down, less than 8.0/1. A big dome piston with stock chamber sizes might get you up around 9.25 to one, not bad. I dont know what you're looking for. John