I have a 1966 or 67 Mercury 410 BIG BLOCK.It is block and main bearing caps.It is the very thick wall with high nickel and be bored out to a 429 and still be strong to with hold any amount of HP.I have no use for this so I am looking for offers and not insults.If you are truly interested I will pay to have it checked out at a engine / machine shop of your choice.716-725-4122 leave me a message if needed,Bob |