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Well, we finally finished the install. The 7120 and matching exhaust is now on. I did have to get some custom exhaust work done, the 0331 had two exhaust outlets, the 7120 exhaust has only one. Everything seems to be running good. I did run into some problems. First off I need to fab up the...

Well, I finally got my 7120 in. First off, I cannot believe the difference in the weight between the two. The 0331 is about half the weight of the 7120. I do need to find a exhaust manifold to fit the 7120, the old cast iron one from the 0331 will not fit. I'll try to get some pics up. By...

I recently had the honor of joining the cracked cylinder head club. So the question is, now what? I searched the forums and came to the conclusion that a replacement "0331" is a waste of money. I also learned a "0630" and a "7120" head is a good replacement. I told my mechanic/friend this...

Need a 0630 head to replace a 0331. Thanks-

Hello all, firstly thanks for such a great site, I've learned/used a great deal of info here. So, here's my question. I'm looking to buy and install a 3" lift on my 2000 classic xj. I've searched so much my eyeballs are on fire. I've seen the RC series II lift contains lower control arms...