plug gap with msd ready to run

[lasvegas69charg]

hi. What plug gap should I run using the msd ready to run ign , 8.5 mm wires and blaster coil Thanks.

[plum500]

I'm curious as well...even with simple electronic ignition upgrade, I was advised to open them up a bit. I can't remember what I set them at, .042 rings a bell. (stock is .035 I believe)

Will be going all MSD shortly...

Found this thread: https://www.msdignition.com/forum/showthread.php?t=15039

[lasvegas69charg]

yeah .035 is stock.  i was thinking bumping it up to .045

[Chryco Psycho]

.040 - .045

[Plumcrazy]

I have the Mallory Hyfire box on my car which has 10.5 to 1 compression. I tried running a .045 gap for a while.  The only difference I noticed was that shorter distributor rotor life so I went back to .035 gap.

Maybe with less compression you can get away with a bigger gap.

[lasvegas69charg]

can you feel a difference between a .035 and .045 gap.

[plum500]

...thinking about this a bit more, wouldn't the use of multi spark stuff like MSD actually reduce the significance of a gap difference? ...so the difference realized between .035 and .045 would be less with MSD, vs a stock ignition style?

[skip68]

I gapped mine at .042     

[68X426]

Check here too: http://www.dodgecharger.com/forum/index.php/topic,63517.0.html\

After experimenting, 48 is my sweet spot. (505 Hemi with MSD, MSD wires, Blaster, Champion cut back plug, INDY heads, single 850 carb).

I remember Ron said 50. I think you need to start at 45 and move up and down to find what your motor likes.

[skip68]

Yep.  After We re-did my motor I gapped them at 42.