Hi, i have a 350 chevy in an old 1954 international pickup ,it has some performace parts, and the readings on my temp gauge are all over the place from 180 to 220 but usually around 190-200. the temp every now and then will spike. it changes very quickly, like in 10 seconds it will go from 190 to 220 and back. this even happens in 20 degree weather and driving at a constant speed at 40 mph.
i have had two different radiators, two different mechanical temp gauges, two different thermostates, three different fans, and a new waterpump. my latest combination is an aluminum 2 1/2 inch thick aluminum radiator 19 in by 21 in and 180 thermostate, and flex fan.
could it have over heated? could there not be enough flow?
the oil didn't look murky and the antifreeze wasn't either