1996-2000 Serpentine bracket bolts

[Shamrock72]

Hi everyone

I've searched for the past week all over the net to try to find the bolt sizes and lengths to attached the serpentine brackets to L31 sbc.

A little context, I have a 72 GMC I am swapping an L31 5.7L into. I have all the front accessory brackets, pulleys etc but I do not have the bolts that attach them to the front of the block. I amm astounded I cannot find this info on the internet or even a kit.

I think they are 3/8" but lengths is what I need. Can anyone help me out?

[speedygonzales]

Use a bolt to determine the diameter and thread pitch.

Then use something small in diameter and long like a pencil to shove into the brackets to get the length.