I am not sure of the company, but they do sell a bit, that you install in place of one of your valves, and put the other end in the chuck of a drill, and install the heads. It is the same size as the valves you are using and makes a perfect notch, as long as you don't cut too much. I saw it in one of the MM&FF articles.
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-1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway
-1994 Ranger w/ 427cid windsor (daily beater)
check it out!
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