Originally Posted by fizzwater2

I do as others have mentioned - hold the head down tight and just start the screws in until they are touching the head, you don't want to rock the head any when you are starting. Get all of the screws to touch before you start tightening.

I start at 6 in lbs, the first time around, and then make another pass at 12 in lbs. Haven't warped a head or had leaks yet doing it that way. I tighten one, then go straight across and get the one directly opposite it to avoid rocking the head - then I move over two, tighten that one, then directly across, then the remaining two (on heads with 6 screws)