An update on where this radiator problem is at, firstly I had a few weeks off for medical stuff but I was back on the problem yesterday having had the NOS spring from the UK. It was just as bad so I thought I had better go back to square one firstly removing the radiator and check the water pump, pump was fine but the radiator seems to be blocked. I filled it with water off the truck and nothing came out the bottom hose, tried flushing up and again nothing came to the top. It would seem I have been heating the coolant in the top of the engine and having no flow through the radiator it's been blowing out the top. A bit like the thermostat not opening but I don't have one, I will try some flushing compound tomorrow. This C8 was sitting in a museum for a number of years prior to me purchasing it so probably only water in but time will tell.
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