[AnthonyG]

GM, not sure what radiator cap I have. It was supplied by Brassworks and I don't see any identifiers on it. I rechecked my invoice and it doesn't say either. I'll have to call them and find out. Per your last post, I checked the water after the last event and there was water about 3/4" up on the d-side hose tube. No more eruptions as I said even running at idle for 2 hours as you said you did with your pickup. If I find out it's not a 4lb cap I'll get the valve. Where did you get yours, I went to the site you provided For Collector and looked all through their stuff and didn't find it?