AMC Eagle Den Forum
The Mighty 258 => Engine Electrical Systems. => Topic started by: Sandeagle on December 23, 2015, 01:53:54 PM
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After reading a bunch of stuff on this site I can never find what I am looking for. I just ordered a D.U.I. From 4 wheel drive parts, a recommended D.U.I. And the 8MM wires. I remember reading somewhere that some plugs are terrible. What are recommended spark plugs. Good plugs!! Buy once cry once. Already have the 2150 m/c.
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When I did the big cap/coil swap I bought new autolite copper plugs and the car ran like crap,
I put back in the champion platuim plugs and it runs great, there like 5 bucks each but I recommend the champion platinum plugs
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Thank you,I think your post was the one I was looking for.
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I prefer standard copper NGK's myself.
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Champion or Autolite work great for me, gapped .35
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I've run the Champion Copper in mine and the NGK Copper that Eaglefreek mentioned. No problems. Stock gap is .35, post-HEI gap is a suggested .45.
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I've been changing spark plugs for 30 years and I prefer in this order Champion ,NGK OR Bosch ,Denso. I've never had autolite or ac delco last for very long.
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My msd ignition runs autolites gapped at .45. Never a problem very good fire with them. My stroker turns the tires in 3rd sr4 manual with 2.73's on my sedan.
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Thanks everyone, gonna order both champ.and NGK and will let you know which runs better. Copper seems to be the trick. I am running champions now.
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Unless the plugs were dropped or something, the Autolites should be fine with the correct gap. (there were 2 completely different ranges for our AMC 6 cyls, depending on emission equipment and head design)
I still like the NGK 2288s the best (BKR6EK) which are double grounds and idle without a miss with my HEI and stock carb.
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Copper conducts better, Platinum and Iridium last last longer.
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I've always had good performance with Champion & I'm probably the only who uses a torque wrench to torque the tapered plug to 11 ft./ lbs. The only plug I never liked was AC.
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I personally like the performance and longevity of NGK.