[OrrieG]

Pressure rising as you increase rpm is normal. 15# at idle is acceptable. Spend $20 on a cheap aftermarket temp gauge, your gauge might be reading way off, especially if it is the original stock. Mine started running hot and that is what I found out, it was the gauge. In you case if its spewing but only reading 180 something is wrong. What temp t stat are you running, 185 is standard? What pressure cap, 5 # is all you need. If someone put on a higher pressure cap it can cause problems. You might want to get an inexpensive probe type thermostat, run it up to what you think is hot, pull the cap a see what the temperature is. Are you using just water or coolant mix? Does it have a shroud, if the fan is not close to the radiator, might not be pulling enough air thru it.