6. Like I mentioned earlier, I had gotten a hold of a used Hesco aluminum head. Not to discourage you, but there is probably no way you'll ever find one of these used, and you'll need to buy new. The Hesco head is that precious type of engine mod that people will remove and keep after they sell their Jeep. In fact, that's how I got this one-from a good friend who had pulled it off his Jeep before it was sold. I did me some serious horsetrading to get this aluminum gem.