Yes, if you're pretty steady with a tap wrench. Just pack a rag around the main cap to catch any chips that get created by the tapping job, then hose it down good with brake cleaner or carb cleaner and blow dry. Reinstall the pan, and you're good to go. Don't forget to drill out the threads in the timing cover!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!