I need to know what type of bolts are used on the fan clutch for a 1968 390. There is 4 bolts needed for the fan blade to fan clutch mounting and 4 bolts needed for the fan clutch to water pump mounting. I would like the correct style bolt, washer, and color.

Also, what bolts are used on the fan shroud?

 

Geez the water pump flange is like 5/16" X 24 x 1"
Fan clutch hub I believe are 5/16 x18 3/4"
Now this should be check for fitment first but I'm sure you could find some test bolts at the auto parts or Lowes
Orich

 

377937-S .. Bolt-Fan Clutch to Water Pump ~ 5/16" -24 x 1"

1968/69 F100/350.

 

Thank you!