research metal locking.
if it`s a pin hole,why not drill and tap it then loctite a 1/4 - 20 soft bolt in it.
metal locking is drilling and tapping a 1/4" hole, then locktiteing a 1/4" bolt in, titening it till the head breaks off,then drill the next hole 1/2 in the bolt and half out(following a crack(dead center the crack w/ the drill bit)
make sure you go to the end of the crack , all the bolts will be now broken off, then take a ball peen hammer and peen the end of all the bolts real good. this works perfectly if done right, just be sure to get each end of the crack drilled out in the process! of course this would be next to impossible w/ the engine in the car, but a single pin hole might be gotten to w/ a right angle drill. I did this on the sides of a 426 hemi that froze and burst in three places the repair still holds to this day, it was a 10/40- 10/60 GTX back in the 70`s---------------bob