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Tell the machine shop to use a cutter that measures .100 larger than the valve your cutting.

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So, nobody uses the old "tool bit brazed to a valve" homemade in place cutter anymore? A good way to be sure the cutter is in the correct position is to do the cutting from the actual valve guide that will be above the piston.

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Id like to see a pic of that "tool" John. It was just more simple for me to use a old valve drop it down the guide and punch the piston at TDC, seems that this way would be just as accurate, and cheap to make also.