At any rate, I have another cap that I want to use ( permanently - reads in bad weather ), so I think I am going to drill it by #1 tower to make sure it index's properly, and then make a clear Plexiglas circle that I can silicone over my viewing hole. Any thoughts on that? When you buy a new cap, drilling it is the only way to know for sure that it is indexed properly. I will put up a pic when I do this. I finally got my SB to run 1/2 decent under load. Part of the problem was the 15 degree off on the index. Other part was I live at 5000 ft above sea level. Stock primary jetting for my 3310 was #72 jets. Ended up with #67's. Time for a nap!!!