A project like this isn't something most any of us are going to do with our TJs although I'm sure the guys at Newcomer Racing will have a plenty suitable rig to install a high hp I6 into (like his DD XJ or the project Rambler race car I've heard about). I for one though am very happy for not only somebody out there pushing the known limits of what our engines can do in relatively stock form, but also sharing that info. It absolutely matters to a lot of people interested in much more mild engine builds knowing what is it isn't an issue at say, 500-600hp.
Knowing that the block would easily hold together at that level is pretty significant and not something a lot of engines of that era or later can claim. I've messed around with a lot of JDM I6s and while a JZ wouldn't think twice about that kind of power, you start pushing an RB much over 7-800hp in an awd chassis and they are known to start splitting the block in certain places. The venerable Ford 302 is known for splitting the block in the lifter gallery above 600'ish hp. Now a few dyno runs doesn't mean our beloved AMC I6 is bullet proof, but it provides some never before had data points.
And for anybody saying you "Why would you need more than 190hp in a TJ?" I say put down your purse for a minute, take off those heels, and go find a nice man to give you a ride in a fast car. If you still have to ask "Why more hp?" then you'll never understand.
