Here is a decent book on cylinder head work:
"How to Build, Modify, and Power Tune Cylinder Heads" by Peter Burgess &
David Gollan. ISBN 1-901295-45-1.
I have this book, it's not great but overall is worth having. There are
plans for a home-made flow bench included, along with lots of examples on
how misleading the flow bench figures can be relative to actual engine
performance. The overall conclusion is that flowbench work is "suggestive"
of actual performance. At least it gives a person a place to start. There
are other books that address the topic of cylinder heads but without info on
flow benches and how to use them. A good one is "Four Stroke Performance
Tuning" by A. Graham Bell. Sorry, don't have it handy so I can't give you
Second, about those burrs... In my experience, nothing works better than
beeswax to reduce clogging by Al. You need pure, solid beeswax, not the
fou-fou crap that is sold for making candles. I found a pound of it (enough
for, oh, 15 years or so of steady use) at an artist's supply store.
To apply the wax, heat the burr gently, then touch a lump of wax to the
burr. The wax will melt and flow into the grooves. Don't overdo it, you
don't want to fill the gullets because the cutting edges require some relief
to work correctly.
The burr will still clog up eventually, quicker in some types of aluminum
than others. To unclog the burr brush it gently with a stainless wire brush
( a small brush like welders and platers use) or heat it gently with a torch
or hot air gun. When the wax melts, the Al comes right off with the wax.
Reapply the wax every second or third cleaning. You will find that this
combination will work well on some alloys such as 5052 or 6061, but it will
clog quickly on very soft or "sticky" alloys.
Beeswax is also excellent for lubricating taps. In fact, I got the idea from
a commercial product called "Tap Stick," a solid tap lubricant that I
suspect is mostly beeswax with some coloring and perfume added to make it
seem like a high-tech, proprietary formula. I don't know, maybe they do put
something else in there, but beeswax works just as well and it's about 20X
Also, I have found that double-cut burrs don't clog as easily as single-cut
burrs. Of course, the ideal are the "Aluma-cut" burrs, but they are quite
expensive, on the order of 3X a quality double-cut burr.