I would like to correspond with members in Australia who have or have had the 28 Quads with water cooled heads and aluminum rods and pistons. We in the states had not known of these here or have any info on whether thy left the factory that way or if this was done after the factory. I have seen pix of at least 2 different motors so equipped and possibly 3. You can send as a reply or use new e-mail <sogentiiiky@gmail.com> Jim Ross, AOMCI