Spark Plug Gap on the new Aluminum Head

[ray6966]

General Question:

What's the size of the Spark Plug's Gap when it comes to the CI Aluminum Head?

And if there's no particular number because it all depends on your project, whats

a good starting point and why? 35mm? 45mm? Are there any Tech Articles on

the Classic inlines Page?

Ray
Lynwood, California

 

[bubba22349]

Gap will be decided by ignition system used your coils power and control etc. Start with a .032 to .035 if you have a hot coil you might be able to go as much as .065.

 

[ray6966]

Thanks.. Im installing a DUI.

 

[bubba22349]

With a DUI .050 to .055 will work for plugs you could go with Autolite Racing AR3931 or your favorite equiv. brand of plugs

 

[ray6966]

thanks for the info. Im looking in the summitracing website ( http://www.summitracing.com/parts/FRM-AR3931/).
Spark Plug thread size is 14mm and Spark Plug Reach is .750 inch. for the Autolite Racing AR3931.
If I go with another brand, would I have to make sure the sparkplug is 14mm and has a reach of .750?
would the APP3924 fit? ( http://www.summitracing.com/parts/FRM-APP3924). and the type of material the spark plug
has (copper, Platinum, Iridium, Nickel). I"m assuming each material has better advantages than the other.

Im going to use my mustang as a daily driver. 200CID block, 5 spd, 2v autolite, aluminum head. THanks for the help.

 

[bubba22349]

would I have to make sure the sparkplug is 14mm and has a reach of .750?

Yes they would need to be! Okay than for a daily driver forget about the race plugs not needed (unless you have a turbo) standard Autolite AP3922 Platinum should work great.