have fun with that one...... klz's suck ass to work on!elim70 said:maybe I'm not phrasing right. I want to make some small upgrades. I will rebuild the motor sometime in the near future. My son has a probe gt. He wants to put in a klze j-spec engine. the only difference between the two is ecm, intake manifold, camshaft specs, and .5 points in cr, block is the same. Now a klze can be had for about $1000, but to do a rebuild using the klze parts would be considerably more than just buying a replacement and dropping it in.