Yep 2 or 3 times, and so are the SCE's as long as they don't get all warped pulling them off the studs. I've even reused them with an o'ringed blk and reciever grooves in the heads. Top fuel and funny cars reuse them all the time, if they don't have a melt down.
So are the MLS gaskets.
JMO
Zip.