Author Topic: Plug and gap recomendation (Read 1167 times)

lime73 · « **on:** August 28, 2011 - 05:20:23 PM »

What is a good plug and gap for a 440 with MSD box and coil?

Chryco Psycho · « **Reply #1 on:** September 01, 2011 - 03:04:10 PM »

Champion RJ12YC gapped at .040

MEK-Dangerfield · « **Reply #2 on:** September 01, 2011 - 05:01:03 PM »

I have Autolite 85's in mine, gapped to .040 You don't want to go bigger than a .045 gap.

mojavered · « **Reply #3 on:** September 01, 2011 - 05:47:43 PM »

Why would you want them gapped at .035 or .040 gap or even a .045"? Thanks.

mopar12372 · « **Reply #4 on:** September 01, 2011 - 06:27:49 PM »

hotter spark mutiple discharge spark.

Chryco Psycho · « **Reply #5 on:** September 01, 2011 - 08:12:19 PM »

Maximize the spark as stated above , if you go more than .045 it shortens the life of wires & rotors etc

mojavered · « **Reply #6 on:** September 01, 2011 - 09:06:38 PM »

So, is it better to run a .035 or a .040? I gapped all my plugs at .035. If I pull them and change to .040, will I notice anything at all?

mopar12372 · « **Reply #7 on:** September 01, 2011 - 09:37:27 PM »

we where talking about the high fire msd systems BUT if you have a high fire ignition on your car then 40 would be fune . 035 was for stock .

Chryco Psycho · « **Reply #8 on:** September 01, 2011 - 10:39:21 PM »

I doubt you would feel any difference with the extra gap unless there is other problems