What kind of squabbling is it?
My two teeth chatter/ nose off/ square up to one another (lunge and then have a popcorning fit)/ rumble strut/ hump etc. this is all normal, and seperating should only happen if blood is drawn. If the humping is excessive you could try putting a mesh divider in the cage for 15 mins just so they can have a rest from one another and cool down.
Another thing is to put plenty of hay down (pref. in two seperate racks at either end of the cage), three hideys with two exits so they cant bully one another into a corner, rearranging the cage can help and two of everything bowls/water bottles etc. If you can try making the cage bigger, boars seem to get along better in larger enviroments.
If you've done that already it might be an idea to try a bonding bath so they smell the same, and completely wash the cage/hutch and all the toys, bowls and other accessories.
I wouldnt suggest removing them for a long period of time as they have to start all over again with introductions, i know its hard to watch but just let them sort out the 'top pig' by rumblestrutting, mild teeth chattering, humping etc which can take upto an hour without a break, and this ritual of top pig might be tested everyday, depending on the pig. It also might be down to their age, as dominance displays and tests are usually very heated between 2 months to 14 months old after that boars usually calm down.
Oh and are they housed near the girls? If they can smell see or hear them it might be a disaster waiting to happen, boars rarely stay friends if females are about.
If you have tried this, and blood has been drawn it might be wise to seperate them now.
Ooo and have a read of this thread:
http://theguineapigforum.co.uk/showthread.php?t=28949