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Re: Stripped bolt in valve cover. Best way to fix?
Problem is Helicoils don't work as well as a Keensert. Either is going to be a problem due to it being a shallow blind hole. They both install by drilling oversize then restoring threads. The helicoil uses a wound diamond shaped steel coil to creat a thread within a thread. The keensert is a threaded sleeve that isn't prone to unwinding like a coil is or have the bothersome driving tang. But most inexpensive "kits" are not intended for blind holes. This probably isn't the project for you to be learning how to install thread inserts on.
If you are going to try and chase the stock threads you will need a bottoming tap. Probably two so you can grind one to a short semi-starter nose. If you can clean them, then a full set of valve cover studs and locktite will keep you from cycling the threads again.
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