I always drill them. I've found the easiest way to drill them is in a drill press, spinning very fast, then hold the plug in your fingers, and, while bracing your hands, slowly feed the plug up into the drill bit. I have drilled many plugs this way and only broke one drill bit.
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Paul Carter
Carter Cryogenics
www.cartercryo.com
520-409-7236
Koerner Racing Engines
You killed it, We build it!
520-294-5758
64 GTO, under re-construction, 412 CID, also under construction.
87 S-10 Pickup, 321,000 miles
99Monte Carlo, 293,000 miles
86 Bronco, 218,000 miles
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