Fire it up?

Can I fire up my V30 without a radiator for long enough to check the so-called "valve noise"?

I don't know if running the engine without a radiator will damage the engine or cooling system? I just want to see if what I've done so far has fixed the problem?

I don't want to have to refill, try it, drain it again if there's more problems.

Obviously I wouldn't run it long enough to get hot.

What are your thoughts?