In the process of attempting to replace my valve.  It stops turning at a point where I'm not comfortable applying more force, with only about 2-3 threads engaged and 3/4 of a turn left to get it where it needs to be in my aluminum intake,.  If I back it off, it is too loose.  Is there some way to make it fit better or best to try another one?

Are -AN fittings reliable for coolant?  That would make outlet positioning much easier and an inline valve could be used. 


Lawrenceville, GA