UAA AMT 187 HW's 5 and 6 Flashcards | Quizlet
The valve seat is ground to a certain angle and the valve face is ground to a maximum one degree less than the valve seat angle to insure a tight seal and a small contact area. Grinding the valve seat and then using the same to stone to grind the valve to half a degree to one degree below the valve seat angle obtains the fit.