Can you actually see coolant flowing? I once had a brand new water pump that wasn't stamped out way up in side the lower hose outlet. Chased the problem for days.
I'll have to disagree. If that is the case, why would 99% of them have a barb. There is nothing harder ( to my knowledge) to seal than steam. If the system sees excess pressure for any reason, it will find the weak link.
Ok.... Then what about the reverse water flow guys who swear cooling the heads first makes more power. My race car had this when i bought it (Shogun) i believe was the manufacturer