I have a coolant leak between the #3 and #4 exhaust ports, just under where the header bolts to the head. The coolant only shows up there and dribbles down the block just to the left of the oil dipstick tube. Everything else is dry, no leaks on the backside or on either side of the engine. Just swapped this engine in and replaced all the seals & gaskets, has 1100 miles on it now. Any ideas?