Valve Seats: Refacing

On 2.3L models, intake seats, use only a 77 degree angle grinding stone to remove stock from bottom of seat. On exhaust seats, use only a 70 degree angle grinding stone to remove stock from bottom of seat. Use an 18 degree grinding stone to remove stock from top of all seats. Valve seat must be a true 45 degree finished angle with a seat width of .069-.091" (1.75-2.31 mm).