what is the correct spark plug gap for a 440?

[MikeMacCham]

hEY GUYS, I am changing my plugs and was wondering what the correct spark plug gap is for a 1973-ish 440 that ended up in my 68 charger

[Challenger340]

Stock ignition & rpm, I'd go .035"

Hotter stuff, need more info/specifics.

[MikeMacCham]

electronic ignition,

[MikeMacCham]

.035 it is

[firefighter3931]

.035 it is

That is fine Mike....no worries. The Multi spark boxes (MSD/Crane/Mallory) like wider gaps but those gaps are dependant on the engine's compression ratio. With a basicly stock build you can't go wrong at .035 

Fwiw, i like the NGK xr-5's in that type of application. It's an excellent plug in the "right" heat range for a pump gas iron headed 440. 



Ron

[MikeMacCham]