WEll i had my car on the lift the other day and seen coolant on the side of the block very small amount like two drops, looked like it was coming from the head where the head and block meet, I washed it off and ran the car and nothing, coolant was full, no leak so i pressure tested it at 20psi nothing no coolant leak any ideas??

 

Our head bolts near the header go down into the coolant jackets. If you've ever pulled the heads, did you use a sealant on the bolts? Maybe they're leaking a small amount over time. Obviously it's nothing to worry about, but maybe try checking the torque on those bolts.