What spark plugs do I buy?

mustangfan1990

New Member

Jul 17, 2005

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Lenoir, North Carolina

Feb 16, 2008

#1

• Feb 16, 2008

• #1

I have a AFR 185cc heads right now and I think I have 3924s in there now, but Vortech said I need to go 1-2 heat range colder. The spark plug threads are long so I need the same size plugs but a colder heat range any help here what to get or a part number?

 

04sleeper

Founding Member

Jun 22, 2002

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Dallas, TX

Feb 16, 2008

#2

• Feb 16, 2008

• #2

The plugs you are running are 1 heat range colder than stock. If you would like to go with 2 heat ranges colder than stock the number would be 3923.

Stock plugs are 25's. The "39" is just the number before the heat range number and just means it has a longer set of threads.

Hope this helps.

 

mustangfan1990

New Member

Jul 17, 2005

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Lenoir, North Carolina

Feb 16, 2008

#3

• Feb 16, 2008

• #3

cool so Ican keep the ones I have now then right ?

 

04sleeper

Founding Member

Jun 22, 2002

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Feb 16, 2008

#4

• Feb 16, 2008

• #4

mustangfan1990 said:

cool so Ican keep the ones I have now then right ?

Click to expand...

Yes.

 

Grn92LX

Fidanza Man!

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Jan 14, 2001

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New York

Feb 16, 2008

#5

• Feb 16, 2008

• #5

3923's.

 

mustangfan1990

New Member

Jul 17, 2005

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Lenoir, North Carolina

Feb 16, 2008

#6

• Feb 16, 2008

• #6

colder range would help me get farther from det. right?

 

04sleeper

Founding Member

Jun 22, 2002

2,674

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89

Dallas, TX

Feb 16, 2008

#7

• Feb 16, 2008

• #7

mustangfan1990 said:

colder range would help me get farther from det. right?

Click to expand...

True to a point, going too cold could cause driveability problems.

3923's should be fine though.

 

PUNISHER RACING

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Aug 27, 2007

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FORD CITY, PA.

Feb 16, 2008

#8

• Feb 16, 2008

• #8

3923's