Whaddya think about these plugs?
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 degrees before, AFM and idle speed set correctly. Stock and recently professionally rebuilt Holley 1945 carb and auto trans. Runs very well at highway speeds, idle somewhat lumpy at 750 RPM, especially when in gear stopped at a red light. New plugs have improved the lumpiness a bit. What is your opinion of the wear on these plugs. Thanks!
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 degrees before, AFM and idle speed set correctly. Stock and recently professionally rebuilt Holley 1945 carb and auto trans. Runs very well at highway speeds, idle somewhat lumpy at 750 RPM, especially when in gear stopped at a red light. New plugs have improved the lumpiness a bit. What is your opinion of the wear on these plugs. Thanks!
