"Wayne.B" wrote in message
...

On Sun, 30 Dec 2012 10:44:22 -0500, "Eisboch" wrote:

True, but the material the heli-coil is installed in isn't any
stronger. A heli-coil is great for replacing stripped out threads
that need to be drilled out but it doesn't make anything any
stronger.

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I'm assuming you must have to pull the head to avoid getting drilling
chips inside the cylinder?

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I don't know. Never had a V-10 and never had to do it. I've know at
least two people that had a spark plug fly out of the engine though.
One happened on the road beside my driveway. Guy was towing a 26'
boat to the launch ramp in Plymouth. I stopped to see if he needed
some help and at first he didn't know what the problem was. Said he
heard a big "bang" and then the truck started running rough. The hood
was open and all seemed fine until we saw a spark plug sitting on one
of the frame members.