The "face" angle, where the valve actually seats, will be either 45 degrees, or sometimes 30 deg., like on a stovebolt intake valve. The valve seat width is controlled by grinding a 30 degree angle above the seat, and a 60 degree angle below it. On the 30 degree intake, the angles would be 15, 30, and 45. The valve itself usually has only one angle ground on it, but I've ground a relief angle below the seat area on some race engine valves. Unless you're going for high RPM and horsepower, the standard valve grind is adequate for street use.
Jerry
