• Mustang Forums
  • 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
25
2
11
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
3,942
2,896
194
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
3,942
2,896
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.
 
You must log in or register to reply here.

Similar threads

S
Preparation for Holley Terminator X install – Foxbody 306 (electrical fan, alternator, MSD Ignition, etc)
  • So_Flo
  • Mar 1, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 2
Replies
22
Views
1K
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Mar 4, 2026
General karthief
S
Holley High-ram tuning settings
  • spencergt66
  • Apr 1, 2026
  • Digital Self-tuning Forum
  • 2
Replies
23
Views
368
Digital Self-tuning Forum May 12, 2026
spencergt66
S
F
Best plugs for carb'd roller
  • forango
  • Nov 21, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 2 3
Replies
52
Views
940
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Dec 2, 2025
HotFox
3
393W Stroker with Boost - Need Spark Plug Recommendations
  • 387lx
  • Apr 29, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
3
Views
229
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Apr 30, 2026
HotFox
H
New Built 91 Foxbody electrical failure. Need help
  • hassler
  • Aug 18, 2025
  • Fox 5.0 Mustang Tech
Replies
8
Views
437
Fox 5.0 Mustang Tech Aug 21, 2025
limp
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?