Does anybody know anything about the Mercury 410 used in the 66-67 era? I need some help here. I have an FE 410, and I would like to know if it would be worth boring it 60 or 80 over providing a sonic check approves. I was thinking about making it into a 428 if possible. Anyway, does anybody know the stock HP of these things. I don't know too much about these engines, but I am willing to put some time, effort, and money into it. Any suggestions on what to do would be greatly appreciated. Thanks.