depends on your application. I would check them when you un pack them to make sure they arnt crazy smooshed or extra wide. but every tune, motor, setup, heat range, ignition type… has a different gap they run best at.
usually the widest gap you can run will yield a bigger more powerfull spark, but you need a strong ignition source to fire it the wider it goes or the spark can “blow out” and cause missfires.