After I realized I had a warped bottom on a fuel pump stand I started looking at the swap meets and they just about all have warped bases, that must be why they are for sale. Now if I find one that's straight across the bottom and if it's cheap, I buy it and stick in my parts stash. A lot of guys are running electric fuel pumps, so a warped base doesn't matter except for maybe an oil leak. The base castings are pretty thin on them so I can see how they would warp after years of having the pushrod shoving upward on them.