What size studs?

[CO/6]

What are the size for the end studs for the small block exhaust manifolds? The one's I'm finding at the local places aren't working?

 

[1wild&crazyguy]

5/16 corse in the head with fine thread for the nut

 

[CO/6]

Thanks a bunch....hopefully I can finish off the exhaust this afternoon and get her filled with fluids and running.