What is the recommended time period or miles before any carb should be rebuilt? Three years ago I stored my sb vette and right from the start I dropped the tank and flushed it, so only the carb bowl had gas in it. I really didn't put but a few miles on it since I bought it and I didn't have any issues with performance. One last note, I'm sure it was rebuilt shortly before I bought the car since it looks very clean with new hold-down bolts and washers under the bolt heads. Honestly, I wouldn't really know a perfect carb from one that simply works like it should (not sure if that sounds right or if you know what I mean).