What size?

[padreisla]

Ok, I figured out what the noise was coming from the front of my engine. When the pully was put on the harmonic balancer, the bolts were too short and they worked their way loose. So what I need to know is what size are the bolts suppose to be. I have the ones that they put in, and I am going to go to the hardware store tomorrow evening and get some longer. I am also going to add locking washers and/or locktite on it. But wanted to know if anybody knows the proper size of these bolts. Again these are the bolts that mount the pully to the harmonic balancer on a 454.

Thanks....Joey