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Never used a Grizzly but I bet I know what will happen. It will cut just fine but your dado will not have truly flat bottom. It will have ridges because the arbor holes are not held to a tight tolerance and/or the blades tolerance concentrically are not held tight enough. Meaning one blade is going to be higher than the other...
Well, Jeff, you need a router plane. An old Stanley #71 will clean up those dado bottoms very nicely! Lee Valley has a really nice looking but pricey)Veritas one, too.
Sometimes hand tools really do do it better!