Running on assumptions, but he's had it 7 years, and I really can't see him doing an engine pull/install. So I'm thinking it has to be at least that old. The tricky part for me, is I am looking for a body, found a good one, but with this possible engine. But If it is an ess crate motor, and he doesn't really get it, I don't want to be drooling on it. I just asked a couple of real basic questions, checked the oil and kinda glossed over it to make him think I'm just body shopping, and the motor is just a way to get it home. It wasn't shiny aluminum, if it's an aluminum head.