There is a good reason to use the studs as people have said. The Studs have a beveled shoulder which when tightened against the aluminum of the head forms a small bond which increases the possible torque load. In addition, the torque is spread out along the threads of the stud on both sides, not simply the flat section of the hex bolt head. This means the pressure exerted on the stud is less even though the clamping force is higher.
Use the studs. You can get them at NAPA.
/brox