I have 2 or 3 more events this year. One is next weekend, so I've got to get this problem sorted quickly. I'm going to install the new radiator today. I won't be able to report back until I'm at the track again. This won't be a perfect comparison though. Carolina Motorsports Park is a very short track, with short straights, and a lot of low speed corners, which absolutely caused stress on the cooling system. VIR on the other hand has several long straights that allow the car to cool (both brakes and engine) between turns. I've got an oil cooler, so I'm going to put the oil temps to the back of my mind, and stay laser focused on the coolant temps. I am currently researching gauges and will likely buy one soon. HEL Performance has performance data for the oil cooler on their website, and they used an auxiliary gauge to monitor those temperatures, and saw a large reduction in oil temps.