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  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-

Dual sync plug gap

  • Thread starter Thread starter 387lx
  • Start date Start date Jan 31, 2026
3

387lx

Member
Jan 22, 2026
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United States
Jan 31, 2026
#1
  • Jan 31, 2026
  • #1
Just trying to find the recommended plug gap or at least a good starting point, for my 387w running on a terminator x with a Holley dual sync distributor?
 

Bullitt347

I have been doing it wrong this whole time
15 Year Member
Mar 23, 2007
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Middle of Maine
Jan 31, 2026
#2
  • Jan 31, 2026
  • #2
If boosted I would be in the .022 to .025 range.
If N/A I would be in the .035 to .040 range.
 
3

387lx

Member
Jan 22, 2026
25
2
11
United States
Jan 31, 2026
#3
  • Jan 31, 2026
  • #3
Bullitt347 said:
If boosted I would be in the .022 to .025 range.
If N/A I would be in the .035 to .040 range.
Click to expand...
It’s turbo’d going to be low boost for now until I get a meth injection system. Was just curious because was reading online that the electronic ignition stuff likes wider gaps ao was just looking for people’s opinions
 

Bullitt347

I have been doing it wrong this whole time
15 Year Member
Mar 23, 2007
3,975
2,958
194
Middle of Maine
Feb 1, 2026
#4
  • Feb 1, 2026
  • #4
387lx said:
It’s turbo’d going to be low boost for now until I get a meth injection system. Was just curious because was reading online that the electronic ignition stuff likes wider gaps ao was just looking for people’s opinions
Click to expand...
If you have a strong ignition system/coil you may get away with more gap at the plugs. You can experiment a little and find out what the limits are. If you get a misfire under boost, then tighten up the gap a bit and try again.
 
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