Removing LH cylinder head for suspected dropped valve seat on #2 intake valve. Engine was rebuilt 20 hrs ago. Known problem for corvairs with std size valve seats. In the past this problem was almost exclusively plaguing the 140 engine but as our motors age it now is a problem for the 110 motor too. Deep 5/16 valve seats are the most comprehensive fix you can perform. Update: during valve job it was noted that the seats were already the 5/16 deep seats. Complete valve job is being done on both heads.