The ultimate DIY does their own automotive work — including rebuilding that old, worn-out engine. A glaze breaker is for those type of people. The first thing anyone needs to keep in mind is that crosshatching and de-glazing your own cylinders is not something one should charge off and do without some knowledge. Doing so is a good way to turn your workable block into a boat anchor.
The glaze breakers work by spinning the 3″ 220 grit cutting stones in one direction down the bore, then reversing the spin and pulling it back out while it’s still spinning. Done correctly, the stones produce a diamond pattern and remove the heat-polished glaze from the inside of the cylinder bore. An adjustable stop-collar permits quick selection of 2″ to 4″ and 4″ to 7″ range settings and serves as a safety stop if the tool is extracted from cylinder while turning. This model works with any 3/8″ or 1/2″ chuck electric drill.
De-glazing makes the cylinder more efficient and can restore an old block to new condition. But remember that tolerances and technique are important here. If you’re not sure how to proceed, ask someone who has done this before. Learning this skill isn’t worth trashing your block.