That's pretty rich coming from someone who picked Boralogist as his internet handle ... Brief experiences? Hardly that. I've already documented some of my experience driving this car at high speed and that was just my forays to and from that race over a 4 year period. I've owned mine since 1987 and have put 40K miles on a car I bought with less than 3K on it. If you have such a superior knowledge and experience driving this car how about sharing it with us. I share a lot of stuff about my experiences with my cars in order to help other hobbyists. I'm not making any money doing this. Take another look at that video which is of horrible quality and pause it at the front end shot where you will clearly notice that the headlamp buckets are being pushed up. That's another indication of airflow issues with air having trouble flowing through that tortuous radiator path. I spoke with my friend (former Bora owner) again yesterday and he thinks he's finally figured out why the Bora can sometimes get air into the cooling system. Pump cavitation is one of the things he worked a lot on eliminating in his Bora. It has a straight vane impeller which is very efficient at pumping but at high rpms is likely to cause cavitation more easily. My friend owns a company that's been in the pump business since the early 1930s. They now design and manufacture the cooling system servicing adapters and tools for companies like Snap On and others. Recently while developing a prototype set of adapters he was attempting to draw a vacuum on a cooling system found that he was drawing in more air into the system via the radiator cap's vent. So he wonders if you run the engine up to high rpms in 1st & 2nd then perhaps the pump cavitates and pulls air into the coolant via the cap on the reservoir creating lots of bubbles? Until those bubbles separate from the coolant and exit the system efficiency is reduced. It's something to think about.