spark plug gap

[Mustang5L5]

I use 0.054"

For those of you who still have your coil covers it states on the emmissions label that the gap range is 0.052-0.056".

I don't know why so many reference manuals state a smaller gap, because every emmissions label on a 5.0 i've seen states the 0.052-0.056 gap range.



I'm talking about 87-93's specifically. Unsure on the early cars

 

[G-Man5515]

.054 seems to run and idle the best for me