Question on head shims?
 

I am putting my truck back together,this is the second time the head has been cut.First time is unknown how much it was cut.This time was cut 6 thousandths.I am very weary of using this.Do I even need to use it?? Scared it will create another weakpoint in the head.Also I am not looking to buy a new head.Need info ASAP truck has to be running by this weekend,Thanks in advance guys!!!!