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On the 750's, including the Atlas, and to a lesser extent on the 650SS also, head gaskets were a weak spot. Even my Norton works hack 650SS blew two head gaskets in the 18 months I used it as a ride-to-work. I suspect that the increase in bore after the 600 Domi left too little material round the edge of the gasket. It probably still had the same p/n as the 500!