I used a Canton racing products aluminum recovery can and Stant 16 lb. cap. Cap has both upper and lower seals. Everything is new. Overflow from radiator is plumbed to the bottom of the tank. Tank is vented via an overflow port at the top of the tank. Tank also comes with a clear sight glass style tube. If I top off the radiator cold I don’t push any coolant into the tank. System seems to hold pressure. Is it possible cap is bad or rated for too much pressure?
