thanks for the input, I actually found some heads to replace the 4X that I have now. Now I need a little help to id these heads. One of the heads has a 16 on the center exaust ports. It has a small G M cast on the rear exaust port, and a 5 on the front exaust port. It also has a stamp near the valve cover lip it reads H089. The other head has a 76 in the center ports, a big G M on the rear port, and a big G on the front port. The code on this second head near the valve cover is G289. The G in the last code might be a 6. To close to really distinguish. Any suggestions on what I have in my hands?
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