Jeff,
Happy to beat dead horses. That is much easier than trying to push dead Cobras!
We try for the following:
All measurements are in Celsius (because that is how the original cars were)
85 degrees really sweet
95 degrees, no big deal, pretty normal for summer driving
100 degrees, no big deal, but I tend to look at the gauge more often
105 degrees, start to get worried and look more at the gauge than I do at the road
110 degrees, time to start looking for an open stretch of road to open it up and get the air going over the radiator to cool things back down
115 degrees, better find that open stretch of road
120 degrees, find the road NOW or PULL OVER
125 degrees, PULL OVER AND SHUT DOWN OR YOU WILL MELT DOWN!
130 degrees, time to look up Keith Craft's phone number.
Luckily, I haven't seen temps above 105 for a long, long time on the street.
Now, if you are leaning on the motor on the track, 110-115 is pretty normal for a hot day. But, then again, a track is very controlled, you aren't going to get caught in traffic or at a stop light and you can always pit if the crap hits the fan.
David