I've had the FFR 4170 up and running for about three months. In that time I've had it up to temperature maybe three or four times. Each time the new 16 Lbs radiator cap (not Moroso) has leaked. At first a great deal of water sprayed out. On successive attempts I had bent the tabs on the side of the cap which helped to a good extent. I'm using a Moroso filler tee mounted in the horizontal tube at the top/front of the motor. Is there an easy fix, has anyone experienced this problem? Does it have anything to do with air trapped in the cooling system? Of course and unfortunately I have a Highway Patrol safety inspection on Tuesday (steam coming out from under the hood would not be a good start). So far on the shake out this is the only problem I haven't been able to solve!!!!