tap

I broke a bolt off on my tailgate, and decided to try welding a new bolt to it in order to get the bolt out. I've seen it done (on youtube), but never did it myself. The bolt broke off because the threads were fowled up. Luckily, it broke off with a nub sticking out. In hindsight, I...

Had a valve tap. Ran a quart of Marvel mystery oil in it. Did not go away. Replaced lifters. Cam looked good. Still have a valve tap.