Lol, I actually don't know at the moment, I had the factory set running at 45 lbs pressure plug up while 
on a hunting trip right after I rebuilt the motor., so I bought a set at a shop in the middle of nowhere 
off an engine sitting in their shop. Its been running so good since then I am almost scared to touch them.. 
I have a writeup somewhere....  Gotta find it its more than I want to re-type... :)
Dave