According to
http://www.edmunds.com/used/1992/che...129/specs.html a 1992 Camaro had a curb weight of 3,220 pounds. According to
http://www.edmunds.com/used/2002/che...303/specs.html a 2002 Camaro had a curb weight of 3500 pounds. I guess the 3750 pound figure mentioned a few times in this thread wouldn't be too bad, and is in line with the general weight gain trend.
It's funny, I used to prefer cars to be heavier, but these days I'm not so interested in mere heft.
Food for thought: My 1980 Buick LeSabre, at 217.6 inches long x 74.6 inches wide, has a listed curb weight of 3503 pounds.