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I'm sure this question has been asked repeatedly but the search feature will not allow the word "gap" to be searched. Therefore, what gap are you guys using for the Autolite 3923s in your Magnum V8s? I've heard .035 and .040 so I'm not sure which one to go with. My mods are in my sig.

 

.40 is from the manufacturer, thats where my plugs are at

 

Experiment, find out where you get the best idle and acceleration. Then you'll know for your engine/setup. It only costs you time. I'd try .002 step increments between .035 and .045 if you're running stock ignition components. If you have 2 steps that seem nearly identical and are acceptable, use the smaller, as electrodes erode over repeated firing and the gap slowly widens.

As a general rule, too small a gap can lead to a little unburnt fuel . A larger flame kernel is desirable as a slight timing advance, which happens with a stronger spark from a wider gap, but too big a gap can cause a need for more frequent regapping, misfiring at WOT, or in the worst cases, severe misfires or no firing at all.

 

I have heard .035 for the 3923's but I left mine at .040. I need to check/re-gap them soon, so I may try going .035 to see how she runs.

 

On the radiator support are the specifications for plug gap. They changed during the 2nd gen years as mine are .40 for a 99 5.2 and some earlier ones were .35.

 

set my 3923"s at .040.i checked them all before install and i only had one that was off a little. it was about .035.

 

Thanks, guys. I'll just try them at .040 and see how it goes. I have a hotter coil so maybe .040 is just about right.

 

I gap mine at .038.