I finished grinding my block for 383 stroker assembly a couple of weeks ago. I found a tip to help cut down on metal dust particles. Take a magnet any type, and put it in a zip lock bag, then place the bag as close as you can to the area your grinding. I put mine in the direction of the flow from the grinder. When you get thru grinding remove the bag from area and then slip the magnet out, this will catch most of dust and leave you with a clean magnet afterwords.