Saw 440C at 130 kph today.
Mechanic said he put it there because that was the closest it would fit. Not sure if that was because the probe was longer than the width of the pipe or what.
Those temps seem quite low. At what RPM did you see 440C?
I see 630C at the end of the straight at Mosport, about 600C at shannonville.
650-660 you start to melt pistons.
I install the sensor 12-13" from the piston. Your's is at least that far from the port. It will work for comparison purposes but I don't think you're getting a true reading of gas temps.
I have some "K" sensors that are much shorter if you want one.