This listing is for a pair of Mercury 150HP Black Max Outboard Engines. Exact years are unknown but believed to be late 80s. Engines start right up and idle but will more than likely need the carbs cleaned from sitting for an extended period of time. There were some small fuel leaks from some of the hoses, so some may need to be replaced. This setup is a counter rotating pair with 25" Shafts. Compression on all cylinders is at 110PSI on both motors. Lower units are in good condition and go into gear without issues. Swivel brackets have some rust on them but have no issues turning.