Has anyone had these for a while and did you have any problems since installing them? I have a GM 3.6 with COP and want to replace stock plugs.

I've had these for 2 years and I havnt had any problems after installing. Noticed a difference in performance and fuel economy

how do they work on a mustang 2012 v6 ?

Thank you for inquiry. Yes, this will work on 2012 Ford Mustang V6. Don't hesitate to contact us if we may further assist you.

What size socket wrench does this fit? When measured, it fell between 9/16" and 10/16"

There is no such thing as a 10/16" socket. I0/16" is 5/8". I use a 5/8" spark plug socket which has a rubber insert so the plug stays in the socket when taking out and installing. Saves a lot of trouble. Socket wrench is what you install the socket or extensions on which you will need.

Suggested torque for these in an aluminum cylinder head?

According to NGK, it depends on the plug's diameter: 18 mm 35 to 40N·m (3.5 to 4.0 kgm) 14 mm 25 to 30N·m (2.5 to 3.0 kgm) 12 mm 15 to 20N·m (1.5 to 2.0 kgm) 10 mm 10 to 12N·m (1.0 to 1.2 kgm) 8 mm 8 to 10N·m (0.8 to 1.0 kgm)

Brand	NGK
Core Material	Iridium
Thread Size	14mm x 1.25mm
Top Material Type	Metal
Vehicle Service Type	Motorcycle
Global Trade Identification Number	00087295165096, 00087295065099
UPC	087295165096 087295065099
OEM Part Number	LTR6IX-11
Manufacturer	Auto Extra
Model	NGK6509
Item Weight	1.58 ounces
Product Dimensions	37.4 x 9.84 x 8.27 inches
Item model number	LTR6IX-11
Is Discontinued By Manufacturer	No
Manufacturer Part Number	LTR6IX-11

Spark Plug, NGK Iridium IX, 14 mm Thread, 0.984 in Reach, Tapered Seat, Stock Number 6509, Resistor, Each

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