I've bought and reworked, or will rework close to 2 dozen promos over the last several years, but I've never bought any that had any warping to them at all, except for 2... a '58 Dodge with a very slight upward slope of the front side trim, and a '58 Pontiac with the same problem. All of the '58 Pontiac promos that I've seen have the same issue.