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What test pressure are you using to get 820?

What you have now is a cross flow radiator. It might be too small but if it cools the car sufficiently at speed it should be able too cool it at idlle and low speed. The difference is mostly you have less airflow and less coolant flow at low speed and idle. I would focus on air flow first...

It's likely it is a dual pass radiator. Look for weld marks where the divider is welded in approximately half way up the tank.

Tech Talk #78 – The Big Chill: How to Avoid an Engine Meltdown This is from tech talk #78. "Why are drag racing engines prone to meltdown? We’ve all watched NASCAR engines run 600 miles at wide-open throttle on a sweltering summer day without problems. At the Bonneville Salt Flats, land speed...

I'm not going to agree 100% with that. "best cooling system" could be defined in different ways depend on how you score it. But I'll define it as the cooling system that has the potential to remove the most heat. A performance car driven on the street is not being "exercised " vigorously for...

I might add that if any part of the cooling system isn't up to the task then the thermostat won't be able to regulate temperature.

I could be wrong but I think Robert Shaw makes the thermostat for Stewart Components. Stewart Components modifies the thermostat for racing by drilling bypass holes in it.

Your street car and my circle track car are polar opposites when it comes to cooling system requirements. But for the sake of this discussion let's say that what they have in common is that they both have motors that make 400 horsepower. That is the point I was making in the post. Different...

Well I thought I would try to see things with my own eyes. I grabbed a new 180deg thermostat and a pan of water and heated things up. These are my observations on this ONE test on ONE thermostat. So in no way would I consider this conclusive. 1. heating water and holding the temp over time is...

Maybe one of you could put a pan of water on the stove with a thermometer and thermostat and show the other who is right.

Was there an anser to my question about ethanol fuel or did you accidentally quote me?

Are you saying that changing to a sparkplug that is 2 steps cooler will mover the needle on the temp gauge towards cooler? If so how does it do that? Thank you.

First I've heard of ethanol fuel aiding in overheating. How does ethanol fuel aid in overheating?

I said this in another post but the application can be what determines what fan does the best job. The horsepower rating of the engine is not necessarily a good yardstick for what fan is needed. For example: You have an engine that makes 700 hp and you use that power for an occasional burst...

Like most things it can be application specific. Once the cap lets all the water out it's game over. A higher pressure cap might buy you some laps or a little more time. That might be enough to make the difference between finishing in the money and a DNF. If your application is just cruising to...

Is the front of the radiator support open to the entire radiator core?

Something to try as an experiment. place a high cfm fan like a furnace blower/ carpet blower or multiple fans directed ar the front of the radiator. See if this changes the overheat at idle condition. Try with and without shroud possibly. This might help narrow things down based on how it...