Im installing an MSD digital 6, MSD recommended .055 for plug gap but curious what others are doing.

It depends. But I almost never go over .040 and most of the time I'm at .030-.035. I've gone lower than that with powere adders.

Generally, if you can go over .040 you have low compression, small cam, stocker type components.

Good luck on that digital six living AKA, the plug gap is determined by many things, compression ratio,intended upper RPM limit, fuel type and most important is the spark plug wire type I've never used any of the street and strip MSD boxes so I've never read the instruction for them, does it say to use resistor type plug wires only? If so does it say to use spiral wound outer solid wire around the center core? If not use the ones you like the best, same thing if it does say to use the more expensive race spiral wound type wires If you want to find the best gap for your current combination start off at .055 and drive it, if you like it and you want to test and experiment try .065 and so on upwards until it starts to miss at the upper RPM If it misses at .055 close it down to .045 and see if that is the best gap for your combination Let us know what you do

What up with the digital 6 living?

Nothing the matter with them at all, people just like to blow up old rare failures into "good luck with your digital 6“ statements.

Mine has been flawless for 5 years now.

I run my gaps really tight but it's because it's a boosted motor.

.040 here

I have been running my Digital 6 for 5 years also and I have only ran my gap at .035. MSD distributor and MSD wires.

The AL6 box calls for the same gaps, around .055". I do not gap that big. More gap increases secondary voltage and "loads up" the cap, rotor and wires more. I want my cap, rotor and wires to live and be reliable so I gap at .040" or .045" max.

Keeping gaps on the low side would be especially important if using a factory style distributor/cap/rotor to trigger the MSD. they were designed for .035" and that is what I would run with the MSD.

3 or 4 yrs ago there was a bunch of folks on here having thier digital 6 dying at a very young life. Who knows how old a unit is on the shelf when you buy it so I would much rather be overly leery than being broken down half way to nowhere when it fails. I have a Mopar Orange ECU that is over 10 yrs old that is still running good so keep that in mind, soem parts fail from every maker, some makers parts fail more than others I've had three MSD race boxes die in my 40+ yrs racing carreer, one(404B) was my fault by flooding it with water when rinsing the motor off after cleaning it, The other two died on there own

I run a Chrysler distributor to trigger my MSD in an attempt to keep it looking halfway "stock". It works great when you find one with a properly machined reluctor.

Come on, Cab.... First it's "good luck with the D6+", then later it's "I've never run an MSD street-strip ignition"..... I'll consider that opinion baseless. I've been running my D6+ box for 6 or 7 years with no issue.

I run MSD's suggestion of a .055 gap; no issue with caps, wires, plugs.... figure they know more about ignition than I do. My guess is that's true for just about anyone here as well. If you're gonna run their product, might as well take their advice on how to run it.

.035............

I have been using MSD products since the the late 70's. W/each unit I tried to run the gap as suggested. All the engines ran better w/a much tighter gap. On my street engines I typically ran .40 on my strip engines usually .35 but on some closer to .30.
I had better plug life and performance. I understand that the manufacture may suggest one thing but that is a general recommendation not an absolute.
By the way very nice 67.

I run .045 on my 11.2 to 1 360, with msd wires and pro billet dist. I run ngk plugs and on there web site they claim .045 is the max gap on there conventional plugs.

For what's worth my digital six box caught on fire during drag week 2014, while I was going down the road.

That same year I spoke with msd tech on sight because my spare digital box had a high end misfire. He claimed large gaps did nothing but make your ignition work harder and there was little if anything to gain. I got a little frustrated with their products and dropped them all together.

.055 is too much and just not needed
Less issues with tighter gaps--.035-.040 will do just fine with any plug/wire combo

If you take a lawn mower in because it will not start they close the gap and she fires right up

I run a .017 gap with my alky injected with Vertex mag always fires at the plug and not somewhere else--runs great!

Close your gap car will run better!

---and the average is ---- .042".

When I ran my 340 Duster in stock eliminator with a 7al any gap larger than .045 slowed the car down. I ran it at .035.

My advice is stay on the lower side. As stated, wide gap is not needed.

I ran 0.042 inch gap with a 7AL2 and old small coil. 14:1 compression. Installed a MSD heavy duty (high output) coil and preceded to waste several distributor caps as the center electrode was overheating. Changed to 0.030 inch gap and all good.

Yep, and I`m on my second MSD 6200 box in 20+ years.............