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4.6L General Discussion This section is for non-tech specific information pertaining to 4.6L (Modular) Mustangs built from 1996 to 2004.

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Old 01-13-2008, 06:38 PM   #1
2000AZ5.0GT
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Default Spark Plugs

Hey guys, its time to change my spark plugs, and everybody seems to have a different oppinion as to what brand and what stage to use. What would the blower guys on here recomend? I have heard people mention NGK TR6's at .035' gap, just trying to figure out what the best possible plug to use would be. thanks in advance, by the way, heres my setup at this point:

-298cid forged shortblock with Mahle Pistons 8.5:1 compression
-P&P heads, comp cams blower cams, titanium valves, New valvesprings,
- Stock PI intake
- MSD coil on plugs
-Vortech T-trim at 14lbs of boost
-"interceptor" automatic with wide ratio gear set and 2400RPM stall converter
-Braced drop in 9" rear end with 3.73's

Again, light you guys can shed on what plugs to buy would be great
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Old 01-13-2008, 06:44 PM   #2
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Default RE: Spark Plugs

TR6 just like you said w/ the blower you want a colder plug
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Old 01-13-2008, 06:49 PM   #3
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Default RE: Spark Plugs

cool, thanks alot, Ill do that later this week
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Old 01-13-2008, 06:52 PM   #4
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Default RE: Spark Plugs

NGK BR7EF's.
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Old 01-13-2008, 06:58 PM   #5
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Default RE: Spark Plugs

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ORIGINAL: 1SLO85

NGK BR7EF's.
Thats why I asked, because I knew that you had at some point said that the TR6's weren't the right ones. Is it still the ~.035" gap?
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Old 01-13-2008, 07:10 PM   #6
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Default RE: Spark Plugs

i run tr6's
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Old 01-13-2008, 07:31 PM   #7
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Default RE: Spark Plugs

for 14psi of boost I would run the BR7EF's gapped at .035
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Old 01-13-2008, 08:11 PM   #8
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Default RE: Spark Plugs

vortech says to use oem plugs at oem gap this this true? i just got done putting in 42# injectors and oem spark plugs.
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Old 01-13-2008, 09:07 PM   #9
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Default RE: Spark Plugs

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ORIGINAL: 1fast 99gt

vortech says to use oem plugs at oem gap this this true? i just got done putting in 42# injectors and oem spark plugs.
It really depends on your setup and how much pressure your running. If you are under 10psi, the stockers will probably be just fine, but I would still put the gap down to .040 max. One step colder is a good precaution especially for our stock internals. They pretty much won't hadle any detonation. I ran the OEM (non-platunum) when I was at 8psi for 6 months and never had any detonation issues.

But in his case running 14psi he definitely needs colder plugs and smaller gap.
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Old 01-13-2008, 09:13 PM   #10
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Default RE: Spark Plugs

well i will be at around 10 psi max i gapped them at .049 is that ok?
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Old 01-13-2008, 09:13 PM
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