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NKG Iridium Performance Spark Plugs
The NKG Iridium Spark Plug P/N for 2001 - 2008 Twin Cams is:
NGK # DCPR7EIX (Stock No. 6046).
They are available through any Car Quest auto parts store (CA) for $7.98 ea.
I spoke to NGK's Tech Support and was told these are the best, "Premium Performance" spark plugs available and far exceed the performance of any platinum plug.
I also noticed that our local HD Dealer has NGK Platinum plugs on the shelf for 13.99 each (lesser performance than NGK Iridium plugs).
CAUTION: NGK confirmed that the DCPR7EIX plugs come pre-gapped at 0.032 from factory. Twin Cam motors require a 0.040 gap.
NGK said not to use any spark plug gapping tool that applies direct pressure on the thin, Iridium (center) rod. Any forcefull prying against the Iridium rod will result in S/P electrode damage and plug failure.
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