[Vwdiesel] homemade valve compressor

[LBaird119 at aol.com]

  Drilling and maching guides is cast iron work (domestic V-8's and such).  
Most aluminum have silicon bronze or phosphorous bronze (I think) 
guides, which are generally press in and out.  Cast ones neeed drilled, 
pressed, shaped and reamed. If you have the tool that fits all the way 
down the guide, when you press or drive then in, then reaming very 
well may not be needed as the tool holds the dimension.  Otherwise 
you need an 8mm reamer.  I've found that you use a good lubricating 
oil for the intakes and something very light or dry on the exhausts.  
You want the exhaust guides a tad more loose than the intakes to 
start with.  
  I can see why you'd test with a new valve.  The exhaust stems 
wear.   Most that I've checked were tapered to .003" of wear.  Not 
much of a test of the guide with a valve like that!
     Loren