Drove the 86 yesterday with the radiator packing installed... Outside temp was @91-93°F. My coolant temps never passed 220°F...It hit 220° while driving away from wind. I hit 227-228°F in lower outside temps the other day.
I probably averaged @212-213°F...reached temps in the upper 190°F range while driving into a headwind. Overall, I think blocking off the sides of the radiator made my temps lower and more stable.
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projekt zeal86 build