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Autolite AR3910X 14mm Racing Spark Plug, 5/8 Inch hex, 3/4 Reach
Autolite AR3910X 14mm Racing Spark Plug, 5/8 Inch hex, 3/4 Reach

Autolite AR3910X 14mm Racing Spark Plug, 5/8 Inch hex, 3/4 Reach

Universal Fit, Gasket Spark Plug Seat Style, Gasket Seat Taper, 0.75" Spark Plug Reach

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Autolite AR3910X 14mm Racing Spark Plug, 5/8 Inch hex, 3/4 Reach
Autolite AR3910X 14mm Racing Spark Plug, 5/8 Inch hex, 3/4 Reach
Autolite AR3910X 14mm Racing Spark Plug, 5/8 Inch hex, 3/4 Reach
Autolite AR3910X 14mm Racing Spark Plug, 5/8 Inch hex, 3/4 Reach
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Autolite AR3910X 14mm Racing Spark Plug, 5/8 Inch hex, 3/4 Reach
Autolite AR3910X 14mm Racing Spark Plug, 5/8 Inch hex, 3/4 Reach
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Details

Spark Plug Seat Style:
Gasket
Seat Taper:
Gasket
Spark Plug Reach:
0.75"
Thread Pitch:
14mm
Insulator Type:
Non-projected
Resistor:
No
Core Material:
Copper
Tip Material:
Chromium Nickel Alloy
MFG. Part #:
AR3910X
Wrench Size:
5/8"
Sold in Quantity:
Each
GTIN Code:
009100032218

Info

Autolite Racing spark plugs feature a X gap ground electrode, anti-corrosive nickel plating, and large ground electrode for better heat transfer. Heat range needed with Standard tip or Power tip Coldest. 

  • 14 mm plug
  • .75" reach
  • 5/8" hex
  • Gasket seat
  • Non-resistor
  • X gap ground style
  • Vendor Number: AR3910X

Notes

Please use the Vendor Number to reference the PDF chart links listed.

Charts

Heat Range Chart (PDF)

Racing Plug Tech Note (PDF)

Understanding Heat Range (PDF)

Autolite Cross Reference Chart (PDF)

Important Messages

  • Get FREE shipping when your order includes this item and exceeds $99! Ground shipping only in the contiguous US.
Some parts are not legal for use in California or other states with similar laws/regulations

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  • In preparation to transplant a 430hp 383 stroker into Project Chevelle, Zach R. made up a set of plug wires for the car. To keep it nice and tidy they needed to be routed just right, be the perfect length and not distract from the engine!

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