I am doing a motor swap here in the next few weeks and was wondering do i need to get some new gaskets or are Mr. Gasket Copperseal Exhaust Gaskets reuseable? Thanks Mike

 

I could be wrong, but I think they're reusable. I've got a set of these I installed for all of 5 minutes and when I removed them they weren't any different. Unless they got crushed or the shape changed, they should be fine.