Description

DELCO 41-940 refers to an ACDelco GM Original Equipment Double Platinum Spark Plug.
Specifications

Part Number: 41-940
Type: Double Platinum Spark Plug
Thread Size: 14 mm
Reach: 0.689 in (≈17.5 mm)
Hex Size: 16 mm
Seat Type: Tapered
Gap Size: ~0.045 in (1.14 mm)
Resistor: Yes (1–2 kΩ)
Center Electrode: Fine wire, Platinum tip, Copper core
Ground Electrode: Platinum pad, Nickel core
Heat Range: 14
Insulator Height: ~2.09 in
Weight: ~0.52 lbs
Features

Designed for GM vehicles (Chevrolet, Buick, GMC, Cadillac, etc.).
OE (Original Equipment) part validated by General Motors.
Double platinum pads for durability and consistent voltage.
Copper core for cooler electrode temperature and fouling resistance.
One-piece suppressor seal for gas-tight fit and reduced interference.