Dude, I don't think its possible to kill the 4.0L even if you seldom ever do any preventive maintenance. They may not be the most powerful/fuel efficient engines but, they are tough.
I'm a newbie for the most part, I have a couple soil grows under my belt. I'm wanting to start a hydro/sog setup. I'm pretty crafty and tend to over analize things so, here is my ideas:
I'm going to build a flood table in my current box that has a 400W HPS, 4" intake centrifugal fan, 4" exhaust...