Valve Seat Correction Angles
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2001 Ford Pickup, 2001 Ford Expedition, 2001 Ford Econoline, 2000 Ford Pickup, and 2000 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
If seat width is too wide after grinding seat, use a 60-degree stone to remove stock from bottom of valve seat (raise seat) or a 30-degree stone to remove stock from top of seat (lower seat).