Product Summary

Gasket Spark Plug Seat Style, Gasket Seat Taper

  • They have 14mm threads and a 7/16" reach
  • Designed to work with a 13/16" hex wrench
  • Plugs are non-resistor, copper core, standard tip
  • Has a spark plug reach of 0.437" and a thread length of 0.4375"
  • These spark plugs are specially designed to fit all 1939-53 Flathead Fords

Key Specs

MFG. Part #216

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Autolite 216 Details

These spark plugs fit all 1939-53 Flathead Fords. Work very well with our ignitions.

  • 14mm threads
  • 7/16" reach
  • 13/16" hex
  • Flat gasket seal

Item Details

7/16" Reach, 13/16" Hex, 14mm Threads


CARB Warning

For race/ off road use only

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.

Autolite 216 Specifications

MFG. Part #216
Speedway Motors Catalog Part #373-216
Spark Plug Seat StyleGasket
Seat TaperGasket
Spark Plug Reach0.437"
Thread Pitch14mm
Insulator TypeNon-projected
Spark Plug Heat Range6
Core MaterialCopper
Tip MaterialNickel Alloy
Wrench Size13/16"
Sold in QuantityEach
NotesNon-resistor, copper core, standard tip.