soo a 3.9L port/polish should be 25% cheaper than a v8 cnc port/polish right?? It should be almost the exact same as the 5.2 minus a cylinder but i've never seen the 5.2 magnum heads up close personally
but i do have access to my old shop that i used to work in. here are some pics of me machining out the center divider, cutting the runners down and boring the tb bores to 50mm. it is still not finished yet. i used to take stock tbs and actually cnc machine them into 48mm instead of just using a dremel to grind out the step and air horns producing only a 43mm tb.