Hi All: I just replaced the plugs in my very stock 1974 Duster. The new ones are the same as the ones that just came out: NGK ZFR5N plugs gapped to .035" with the gaskets removed and torqued to 30 ftlbs. as per the FSM. Attached is a photo of the old plugs from 1-6 top to bottom (front of the car to the back). These plugs had 18 months and 9456 miles on them - mostly highway driving. The engine is very stock and had the head rebuilt about 15K ago. Compression seems good, timing set to 10...
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