hello
No, its fine, no gasket, just make sure the metal-metal faces are good and clean.
I have used blue hylomar previously, then latterly Yamabond (grey stuff, very good, very dear, and TBH, hylomar didn't leak), but I bought the Yamabond (3bond) for the racer (from Rex Caunt- google him if you need some).
Make sure the cam journals are very very clean and lubed too before tying down the cover.
Cheers!
a