Dont forget about ENYA, they also made several open rocker engines. I would post a pic of my OR Enya's but I'm at work and they are at home. So it will have to wait. Also, OS OR also came in a Marine version with water cooled head. I belive that Saito also had a marine version, VERY limited production, or 1 or 2 years only and that was over 20 years ago.... hehe I was just a kid then Hum... I still am a kid, or at least my wife says so.