Valve pocket/bowl hog tools....

RustyRatRod said
I've not used them, I've had a complete set and set them into the guides to see how they work. I liked the idea, but still......my skill freehanding a dremel is fundamental at best. lol I guess I could practice on a POS cracked head.

You can buy bowl hogs from Goodson and use them in a drill press if you can hold the head and level off the guides.

No freaking way would I do a plunge cut with a stone.