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)

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

Product ID: 81919183

Details

Brand
NGK
Core Material
Iridium
Thread Size
14mm x 1.25mm
Top Material Type
Metal
Vehicle Service Type
Motorcycle

🔥Iridium tip for max durability

🔩14mm precision thread

🛡️Superior anti-corrosion tech

€ 27.02

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Description

⚡ Ignite your drive with NGK Iridium IX – where precision meets power!

IRIDIUM POWER BOOST - Fine iridium tip delivers unmatched durability and consistent ignition for smoother rides.
PLUG PLAY UPGRADE - Easy installation with vehicle-specific fit, transforming engine response and throttle control instantly.
ENGINE LONGEVITY CHAMPION - High melting point alloy resists wear, extending engine life under demanding conditions.
CORROSION SEIZE RESISTANT - Advanced anti-corrosion and anti-seizing properties keep your spark plug reliable mile after mile.
PRECISION FIT PEAK PERFORMANCE - 14mm thread and 0.984 in reach ensure seamless compatibility with high-performance engines.

The NGK Iridium IX spark plug features a 14mm thread and 0.984 inch reach with a tapered seat, designed for high-performance engines. Its fine iridium tip offers exceptional durability and a high melting point alloy ensures resistance to corrosion and seizing. Perfect for motorcycles and vehicles demanding reliable ignition, this spark plug enhances engine smoothness and longevity with easy installation.

Specifications

ASIN	B001RLXDYQ
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#718,923 in Automotive ( See Top 100 in Automotive ) #112 in Automotive Performance Spark Plugs #3,786 in Automotive Replacement Spark Plugs
Brand Name	NGK
Compatible with Vehicle Type	Motorcycle
Core Material	Iridium
Customer Reviews	4.6 4.6 out of 5 stars (126)
Global Trade Identification Number	00087295065099, 00087295165096
Included Components	6509
Item Weight	0.05 kg
Manufacturer	Auto Extra
Manufacturer Part Number	LTR6IX-11
Manufacturer Warranty Description	Includes manufacturer provided warranty
Model Number	6509
Number of Items	1
Number of Packs	1
OEM Equivalent Part Number	LTR6IX-11
Thread Size	14mm x 1.25mm
Top Material Type	Metal
UPC	087295165096 087295065099
Unit Count	1 Count

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€ 27.02

Duties & taxes included

In stock

Sold byAmazon PortugalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Portugal.

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