Mercruiser 4 cult engine block. This was in my barn when I moved in, so I know nothing about it other than it says Mercruiser on the side and it's a 4 cylinder because I can count that high. I'd be happy to look at anything else on it if you'd like. Is $25 reasonable for this sort of thing? I don't know, but I'd also make a trade in wine, ammo, ice fishing traps, axes, saws, pitchforks, Tim signs, wood shaft golf clubs or something like that. The more interesting the better.