Drops under engine

'98 Z71, 5.7 w/78k.. I've notice the past few weeks a few drops of what I think might be anti-freeze under the engine in the mornings... the drops are clear, not the telltale antifreeze color... I've looked everywhere to see where they might be coming from but haven't really seen anything definite. All hoses are in good shape and no leaks can be seen. What I have noticed is on both sides of the engine what seems to be "sweating" at the base of the heads where they meet the block and only can only be seen in the mornings... The oil is clean and haven't seen any loss of anti-freeze and it runs great... I'm puzzled, has anyone else had this happen? I'm somewhat concerned that it might be the head gaskets!