Will the 516s run? Yes. But witht he small exh valve is really doesnt matter what's been done to them. The air can't get out. So if he wants to run that head, in that shape, I'd run a MUCH better cam. A modern profile with am bit more ont eh exh side to help the small valve. IMO he really needs to have the larger exh valves installed. No seats if he's mixing race gas(leaded). Just a set of stock 1.75 exh valves and a throat cut to hog the bowl a little. The .509 is a good cam. Unfortunately the quality control stinks and the heads you have are terrible on the exh side as cast/equipped.
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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