How long do plugs last?
#21
RE: How long do plugs last?
Have you checked the idle port clearance in the carb bores? Holley/Demon generally call for about 0.020" to be showing below the blades at idle. You may also look into changing your air bleeds...
#22
RE: How long do plugs last?
We have found good and bad with different brands but mostly they seem to like the stock Motorcraft plugs when it has just a few mods done to it. usually around 50,000 miles, Ford says 100,000 but thats really a stretch, good luck.
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