Are LS1 Valve Cover gaskets reuseable?
I can usually reuse mine 4-5 times without problems. Sometimes they magically seem to swell up a bit and don't want to fit back into the groove in the valvecover, so I just install a new one.
when they get oil on them, they swell up and make it hard to put them back in the grove (have to work them in a little bit at a time). Even new ones are hard to install thought (they are made a little over size).


