PS Pump - Need nut size

[Randy73]

73 340 w/saginaw pump - what is the bolt size?

After taking off pulley on old pump, I put the bolt back on, out of habit. Then turned it in, as a core. :banghead: :banghead:

 

[sicksatellite]

do you mean the special nut on the pulley??
http://www.bouchillonperformance.com/PSnut.asp

 

[Randy73]

That would be the one, thanks!!