Should I gap to my owners manual spec or are they designed to work with the smaller pre-gap they came with?

Harley Davidson recommends 0.40" gap. As to "You should never gap an iridium plug", NGK's website states for Harley Davidson, these should be gapped at 0.40". I've found many websites stating that if re-gap is needed use care not to damage the electrode or the porcelain center. So, it's not that you should not re-gap, it's that you should be extremely careful.

Is this 6r12, if so why does it not say so ?

Because these plugs are IX DCPR7EIX 99 TO 16 HARLEY-DAVIDSON

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⚡ Ignite your ride with precision power and unbeatable durability!

PRECISION PRE GAPPED - Ready to install right out of the box—no guesswork, no delay.
LIGHTWEIGHT COMPACT - Sleek design (3.31 x 0.94 x 0.83 inches) with just 1.44 oz weight for optimized engine response.
IRIDIUM IX ULTRA SPARK - Industry-leading ultra-small diameter center electrode delivers stronger, more reliable ignition.
CORROSION RESISTANT SHELL - New metal plating guards against rust and wear, extending plug life and performance.
TAILORED FOR HARLEY TWIN CAM - Specifically engineered for 1999-2016 Harley Davidson Twin Cam models—perfect fit, peak power.

NGK Iridium IX DCPR7EIX spark plugs are engineered for Harley Davidson Twin Cam motorcycles (1999-2016), featuring a pre-gapped ultra-small iridium center electrode that reduces voltage needs and extends ignition system life. Enhanced with a corrosion-resistant metal shell plating, these plugs ensure long-lasting, reliable performance and a perfect fit for your bike’s engine.

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Brand	NGK
Core Material	Nickel
Thread Size	12mm
Top Material Type	Metal
Vehicle Service Type	Motorcycle
Automotive Fit Type	Vehicle Specific Fit
UPC	700155016542
Manufacturer	NGK
Model	NGK DCPR7EIX
Item Weight	1.44 ounces
Product Dimensions	3.31 x 0.94 x 0.83 inches
Item model number	DCPR7EIX
Is Discontinued By Manufacturer	No
Exterior	Painted
Manufacturer Part Number	DCPR7EIX
Position	Center

NGK Iridium IX DCPR7EIX Spark Plugs Compatible with 1999-2016 Harley Davidson Twin Cam (Pair)

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