The thermostat I installed had the temp, 180 stamped on it and it does have one of those tiny relief holes in it. I was thinking it was low in coolant. I filled it as best I could before I went for a ride. I removed the upper rad hose at the thermostat housing and filled it that way. If I use the rad cap, I can only get a small amount in. I will try and see if it can take any more, later. When I took it out yesterday for a short scoot, this rise and fall of temperature happened over and over again. I was only out for about 15 min, and came back as I was concerned about the fluctuating temp. A friend told me it could be a blown head gasget, but wouldn't I notice the
oil becoming milky or water blowing out the exhausts?
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"The 427 Cobra is easily the highest performance car ever sold for street use. A decent 427 - not the worst, not the best, will go from zero to 100 mph and back down again to zero in less than 14 seconds. All thing considered, you can put together a pretty good argument that the 427 Cobra is the ultimate performance car, judged on any basis you want to name." Taken from; Corvette, The Sensuous American
