autolite plugs

[gtxrt]

what is the difference between autolite 4275 and 75 plugs

 

[bobsgtx]

From years with a Harley-Davidson motorcycles running Autolite 65 and 4265 the difference was the 65 had a black shell and the 4265 had a nickel plated shell. Black shell if sat outside long enough would rust.

 

[Geoff 2]

Have never seen NGK plugs rust...

 

[Cranky]

Have never seen NGK plugs rust...

They have a nickel plated shell.....?

 

[Geoff 2]

Do not know if it is Nickel but it is some sort of plating. A little known fact: Chrys engineers developed Nickel plating & it was used during the development of the A bomb.

 

[AR67GTX]

Must have been a particular type of nickel plating as nickel plating has been used as an available finish for handguns since the latter half of the 1800s.

 

[gtxrt]

went from xr5 ngk to 4275 autolites. the porcelain is shorter on the 4275 so must be a cooler plug. dida check on the 4275 they seem to run cleaner. 4275 are a non resister plug so maybe getting a hotter spark.

 

[MoparLeo]

They just make radio static...