Some of you might have remembered my astonishment when the brand new OEM ACDelco (not professional or advantage) drums came out of the box warped when I mounted them on my Silverado after putting new brake shoes on it. After not being able to tolerate it any more I returned them to amazon (after ACDelco helped me out with the warranty) for a refund. I purchased some Carquest drums next. Same thing. I thought to myself "you got to be doing something wrong." Today I took the truck into a trusted shop. Sure enough, it was just warped drums. He said he put them on a lathe and there was noticeable warp. I tell you what, I'm sick of these [censored] parts. It seems like it doesn't matter anymore what brand you buy, everything is suspect. I don't have a freakin' brake lathe in my basement. It sucks to not be able to count on new parts to be true and round.