Yeah most places that do this type of thing use crushed walnut. As long as you close the valves on the cylinder you're working on and tape off other areas it’s perfectly safe to do it in vehicle.So there’s a way to media blast inside the intake ports and not get the media in the cylinders? This is new stuff to me of course I am old-school and just plain old.
And I am assuming you’re using something softer than glass bead media
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