Are these Rods 6 or 7 bolt?

[BoredDSM]

I recently just purchased a new set of scat rods from someone local who did not decide to use them. How do I tell if they are 6 or 7 bolt? There is also some very minor surface rust on them should I just scrub it off with a scotch brite pad? There is no rust where the bearings go or where the piston is.

 

[cruisintalonawd]

measure the wrist pin hole

 

[BoredDSM]

Yea darran from ffwd helped me out. They are indeed 6 bolt rods.