I've found that with the shorties it's hit and miss with the warping. The thing is, full lengths tend to warp easier but they're also much easier to pry on and tweak into place than the shorties are. Once the shorties warp they're HELL to get on right. Still not bad at all for $10. I've been thinking about trying my hand at making my full lengths a solid flange. I think if i bolted them up to a junk head and then made some connection bars and welded them on while they're bolted on that it would work without warping them.