Hey shaw if you go up in valve size i would lump port it gives you a much better short side radius and really helps the air enter the cylinders
My head had some custome devided ports started out with lumps now i'm turboed so the air it just getting forced in there! But i ran arp studs in every hole except the three intake ports where the cM screws are its not so much the torque but the clamping for a stud has and yes the studs are fine thread on the side that doesnot enter the block
