[olddog]

My aluminum heads were not tapped deep enough on the 4 corners. More accurately they failed to run a bottom tap. The threads tapered tighter at the bottom and locked the bolts up before the heads touched the intake. I could fit a 0.005" feeler between the bolt head and the intake, with the bolt torqued to spec.

I always screw the bolts into the heads with the intake off and make sure they do not bottom out too soon, since that happened to me.

I used the Victor Reinz gaskets and followed all the advice given by Blykins above. I also re-torqued the bolts after a half dozen temp cycles, and every one turned about an 1/8 of a turn (maybe a little less). I think I did this in 2008 or 2009. No issue since.

Full disclosure, I used studs, with stainless steel nuts and washers. Then I put stainless steel acorn nuts on top. The acorn nuts act as a jam nut. The studs were set with a removable lock tight in the heads. Also you have to set the studs at the correct depth to make all this work, which includes the correct length stud. The looks were worth the effort IMHO.