Stock headbolts

To who gives a whoot about the technical side of this. You can see that the arp's will resist permanent deformation to a higher stress or torque than stock head bolts. Ultimately meaning that the will handle higher torquing as long as done properly. The initial linear lines of both hard and soft steel shows the elastic region in which the bolts would either not deform or will deform but return to original shape. As the stress gets higher the bolts will be in the plastic deformation range where they will deform and not return to their original shape or condition. The Apex is the Ultimate Tensile Strength which is technically the point where the bolts will begin to break. Then after that the negative part of lines shows the necking region. This is where the bolt will begin to break and shear off. The end of the lines are fracture points. I would really like to see a stress strain curve based on arp's vs stock bolts though. But I feel that is quite an accurate representation. I do believe that the graphs of the arp's and the stock head bolts would be more similar than the two steels shown above though.
 
A lot of the dudes running big power on stock headbolts have their engines rebuilt too. The straightness of the block and cylinder head have as much to do with sealing as anything else.
 
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