What are the symptoms of a spun bearing?

[gmcchamp99]

Just curious what the symptoms of a spun bearing are? I hear a slight noise from under the car, its a 1977 ford granada equipped with the 302. Runs fine, accelerates fine and drives like a tank but the noise i hear most def is from under the car. i dont hear the tell tale ticks from the lifters and valves. Dont know if this ties into it but i get positive pressure from the oil cap that i have. it has vent holes under the lips of it and after like 3 or 4 days of driving, i get a little bit of oil from it on to the drivers side valve cover. Any help is appreciated

[Jeff Roblin]

I'd drop the oil out of it an go through it with a magnet. If there are metal shavings, you'll find them there.