I've read that it is smart to retorque your head bolts after you have ran your motor for the first time and let it cooled down. But is it really necessary? I really don't want to dig back into the motor and spend money on gaskets if I don't have to. Any experiances? Also, ARP calls for 65 ft-lbs on the head bolt torque. But I've seen in many other articles and directions that some tighten the top row tighter than the bottom row. What are your opinions on that?Thanks a lot guys.