Found my dads original 1971 duster!

Ok guys. Here’s the scoop after installing new thermostat and the lower rad hose spring. I let car idle in driveway for 35 min and monitored temps. Air breather wasn’t on. Not sure if that matters. I read temp at hottest spot- beside thermostat on engine

After 10 min- 186
After 20 min- 207
After 25 min- 215
After 30 min- 223
After 35 min- 224

I’ve attached pics to reference gauge at those temps. I didn’t want to go farther. But I did notice that at times when I was reading temp between intervals, it would sometimes actually be a bit lower. The lower and upper rad hose read a fairly consistent 10 degrees different from eachother. I believe at the 20 min mark the lower was 163 and upper was 173. Keep in mind that I have no shroud on yet and it’s 24 degrees here right now. What are your thoughts, guys?

I should also mention that the engine builder said he doesn’t like temps over 210 or so. But said without me having a proper gauge in the coolant, it’s hard to know. He also told me that I’m measuring the temp at the hottest point (where hottest coolant leaves the engine). I did notice that most of the time if I took temp close to the temp sensor location, it would read 10 degrees or so cooler

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