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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 03-03-2014, 10:13 AM   #1
whtbullitt

 
Join Date: Feb 2014
Vehicle: 1993 Ford Mustang GT
Location: PA
Posts: 14
Default Spark plug gap questions

When I installed the TFS 185cc heads last spring Trick Flow said to run the Autolite 3924's gapped at .045 with the factory ignition.
This spring I am upgrading to an MSD coil, TFI module and new cap/rotor and wires but no ignition box.
Will adjusting the gap be worth it and what gap is recommended?
I only picked up .3 and 3 mph with the heads and I am very disappointed at this point.
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1993 Mustang GT - 51,000 miles - GT40 intake, TFS 185cc heads, B303, 3.73, 190 lph pump, 30 lb injectors, Stormin' Norman hood with functional ram air, pullies, 70mm TB, 76mm mass air, 1 5/8" full length headers, off road h-pipe, flowmasters, lowered 1 1/2", 17" Chrome cobra wheels, UPR rear suspension, drag radials..........
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Old 03-03-2014, 12:59 PM   #2
mjr46
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Default

Quote:
Originally Posted by whtbullitt View Post
When I installed the TFS 185cc heads last spring Trick Flow said to run the Autolite 3924's gapped at .045 with the factory ignition.
This spring I am upgrading to an MSD coil, TFI module and new cap/rotor and wires but no ignition box.
Will adjusting the gap be worth it and what gap is recommended?
I only picked up .3 and 3 mph with the heads and I am very disappointed at this point.
your heads are not the problem, nor the gap on the plug, your bottle neck lies in the gt-40 intake and b-cam and exhaust could play a factor depending on the size as well......while the gt-40 intake still performs well for a 20+ year old intake, it's lower is quite restrictive, when I do a motor, I port match everything as well as look at all the little things, there's a difference between an egine builder vs assembler
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Old 03-04-2014, 03:37 PM   #3
whtbullitt

 
Join Date: Feb 2014
Vehicle: 1993 Ford Mustang GT
Location: PA
Posts: 14
Default

Talked my wife into letting me ship my lower to Tmoss to get done so that should help some.
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1993 Mustang GT - 51,000 miles - GT40 intake, TFS 185cc heads, B303, 3.73, 190 lph pump, 30 lb injectors, Stormin' Norman hood with functional ram air, pullies, 70mm TB, 76mm mass air, 1 5/8" full length headers, off road h-pipe, flowmasters, lowered 1 1/2", 17" Chrome cobra wheels, UPR rear suspension, drag radials..........
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Old 03-04-2014, 03:37 PM
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