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Message: <blockquote data-quote="mbullen" data-source="post: 499156" data-attributes="member: 24594">White Oak, Mahogany, and marine ply are the usual suspects.  The inner board/yoke thickness is dictated by the cavity in which it sets, however the outer board/motor pad is a little thinner - making up the remaining gap in what's available to use in the widest setting of the transom clamps.  Usually folks use ply on the outer because it's stronger in the the thinner dimensions.  For what it's worth, the factory also used a cork sheet under that outer pad, too.  The main thing is to avoid treated materials as all treatment processes use some type of metal, usually copper, and you're then right back to the dissimilar metal problems.</blockquote>