What is the top speed of this Valiant

Do you still have the factory reverse thread lug studs on the drivers side? Those add a bit more confidence while at high speed.

Seriously though, when I delt with motorcycles, we had a web site to go to that you input the bike, the front gear tooth and rear gear tooth into and it would give you that info. But I've had my 170 to 78 mph. Factory gearing, same ol' 13 inch tires, and lowered in the front 4 inches and back 3. No power add ons except a MSD sticker. I was pretty scared.