Do i need anti-seize lubricant with these spark plugs?

You definitely should use antiseize. Anyone who tells you different doesn't know what they're talking about. GM tech for 20 years, and I never installed a spark plug without antiseize, ever! It's even more crucial in an aluminum head.

Will these work for 2014 chevy silverado ltz 5.3?

I have a 2014 5.3 LT and they fit my silverado. Check with a local parts store if your not sure.I bought a replacement plug at sanels.

Will this work on a 2007 Chevy avalanche

Have to check gms part number for that year

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ACDelco GM Original Equipment 41-114 Iridium Spark Plug (Pack of 1)

ACDelco GM Original Equipment 41-114 Iridium Spark Plug (Pack of 1)

Product ID: 45880676

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Details

Brand
ACDelco
Core Material
Iridium
Thread Size
16mm
Top Material Type
Metal
Vehicle Service Type
Motorcycle

⚡Iridium fine-wire electrode for efficient spark

🔇One-piece suppressor seal blocks radio interference

🛠️16mm thread size for precise fit

Description

⚡ Ignite your ride with precision-engineered power!

OEM BACKED QUALITY - Engineered and validated by GM for guaranteed fit, form, and function in your vehicle.
DURABLE LONG LASTING - High melting point iridium ensures exceptional wear resistance and extended spark plug life.
ADVANCED CARBON BURN OFF - Self-cleaning electrode design keeps your spark plug performing at peak with less maintenance.
PRECISION IRIDIUM ELECTRODE - Delivers superior engine idle stability and smooth acceleration for that flawless drive.
RADIO FREQUENCY SUPPRESSION - Integrated suppressor seal protects your vehicle’s electronics from interference—drive smart, stay connected.

The ACDelco GM Original Equipment 41-114 Iridium Spark Plug is a premium, GM-backed replacement part featuring a fine-wire iridium electrode for enhanced engine performance, a suppressor seal to block radio interference, and a durable design that ensures reliable cold starts and quick acceleration. Designed specifically for GM vehicles, it guarantees OEM-level quality and longevity.

Specifications

Brand	ACDelco
Core Material	Iridium
Thread Size	16mm
Top Material Type	Metal
Vehicle Service Type	Motorcycle
UPC	808709061304
OEM Part Number	12622441
Manufacturer	ACDelco
Model	12622441
Item Weight	1.44 ounces
Product Dimensions	4.4 x 3.5 x 1 inches
Item model number	41-114
Is Discontinued By Manufacturer	No
Exterior	Polished
Manufacturer Part Number	41-114