Okay, I know they made a variety of these motors. Which one was the "badass" one that had the boost ports in the pistons? That made them a true 150 right? I am asking because a relative of mine called today and said they had a 1500 in line 6 merc they would give me if I drove up to get it. They are on up in age and do not have a camera phone. If its one of the good ones ill make the trip !

How can I tell or what do I need to ask him to tell me?

PS. The serial number he says he cannot find, I guess its wore off.