Every thermocouple has a time constant... some are faster than others. I experimented with EGT probes on a turbo car and found that longevity was inversely proportional to time constant (due to rugged construction)
![wink wink](/ubbthreads/images/graemlins/custom/wink.gif)
But you're right, for the absolute most accurate and repeatable temp measurements that's the way to go. I assumed (there's that word again) that mine is close since the t-stat opening temp (on 2 different 180 stats) is very close to what I see on the gauge...
I just find it hard to believe that a couple of pieces of cardboard baffling are going to make a significant difference to the airflow through the radiator while driving with so much frontal area open
![shruggy shruggy](/ubbthreads/images/graemlins/custom/shruggy.gif)
I don't have an overheating problem at idle either, just wanted to drop 10 degrees while cruising.
If the core is that marginal I need a better one anyway. I do agree that (sometimes) one gets what one pays for
![smile smile](/ubbthreads/images/graemlins/custom/smile.gif)
Glen-Ray is a bit steep for my budget but I'll buy one if I have to!