I'm in the process of putting on a new alternator, on my 84 f150 with a 300 l6, and when I took the old one off I noticed that the lower bracket for the alternator was missing the bolt that holds it to the engine block. The main problem is I don't know what size or type of bolt it is, and the hole that it bolts into is way bigger than the hole in the bracket.

If anyone could help me solve this mystery I would greatly appreciate it.

 

Never mind I figured it out. Just tapped hole in motor block to 7/16 coarse thread and drilled out hole in bracket to fit.