Works great for lapping valves on an Onan B43G engine. The label doesn't say what grit it says on the label, but according to Permatex, this mix starts off with a coarse grit, and as it's used, the grit gets finer (larger particles are removed). You can hear the difference when grinding the valves - the sound becomes less "scratchy" over time. Don't unseat the valve when you are nearing the end and want a finer finish as the coarser grit will come back. Be careful using a drill to speed up the process as you may end up removing too much. valve material if you are not looking.
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