Plug gap
- Thread starter FordGuy88
- Start date
Flavadave4
Active Member
iwashmycar
20+ Year Stangneter 
Whenever one of these threads pops up and the specs are posted, I have to ask (some of us are wondering):GTOReturns said:
What was the source for this info?
Can anyone think of any reason/revisions to parts that would require the smaller plug gap for the years posted above?
HISSIN50 said:
What's a carb?
It very well could be.
I only have my Ford 1990 Shop Manual here, and can't find any plug gap specs. But I have .050" hand written on the front cover. Not sure where it came from though
If memory serves...
A bigger gap will be more likely to "blow out" at wot, but will provide better spark kernels at low rpms.
A smaller gap can help with cold starts as well.
I don't completely trust my memory on the above points, it has been a while since I considered plug gaps.
Can someone confirm or correct the above?
jason
vristang said:
Dem points you made sound good to me.
I read about them carb thingies once. Not sure on that.
I'm still just hung up on the differing plug gap specs offered on the forum. I think 5L5 and I [and maybe you too Jason] were wondering about it the other day on another thread. A TFI ignition is a TFI ignition.
When I worked with CSK, I noticed that in some cases spark plugs offered by two different manufacturers would list different gaps, even though they were going in the same engine. The autolites always came up as .054" for my stang, though.HISSIN50 said:Dem points you made sound good to me.
I read about them carb thingies once. Not sure on that.
I'm still just hung up on the differing plug gap specs offered on the forum. I think 5L5 and I [and maybe you too Jason] were wondering about it the other day on another thread. A TFI ignition is a TFI ignition.
jgfiveoh
New Member
Interesting, thats what Chilton says.But the Official Mustang 5.0 Technical Reference & Performance handbook says that 1979-1986 used a 050 gap except the 1979's sold in California and the 1985 carbed 5.0. Then 1987-93 used 054 while the 93 Cobra used a 050. Even wierder is that a 1980 8 cylinder and a 1987-93 5.0 used the same Motocraft spark plug. ASF-42
If you run a power adder you should run a smaller gap. Higher HP app's should run a smaller gap or if you have a aftermarket ignition system. Other wise the stock .050 ish gap should be more than adequate. I run a .034 personally but i'm runnin an aftermarket ignition, stroker motor and nitrous so every app will have a different gap.
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