Alex, I'll take aluminum thread tensile strength for 500 please....

2024-T4, 1,710 lbs, times four equals 6,840 lbs.
7075-T73, 1,880 lbs, times four equals 7,520 lbs.

Trust me on this, if 1/4 inch bolts were going to strip out of an aluminum manifold, my feet would be smashed flat by now. It never happened in 50 years of pullin' engines and puttin' engines in.