Spark Plug Choice for Aftermarket Heads

T

The Dan

New Member

Jul 16, 2003

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51

Orange County, CA

Nov 16, 2004

#1

• Nov 16, 2004

• #1

What plugs are you guys with alum. heads using? I'm currently running the original style BF-42 plugs, but don't know if I might get more benefits with a platinum plug install? My set up is in the sig.

 

6

64.5 GearJammer

New Member

Dec 4, 2002

175

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56

Halifax, VA

Nov 16, 2004

#2

• Nov 16, 2004

• #2

I run Autolite 3924's in my Trick Flows

 

66P51GT

New Member

Nov 7, 2003

721

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Cerritos, CA

Nov 16, 2004

#3

• Nov 16, 2004

• #3

From the AFR site:
Spark Plug Starting Range Autolite 3924

 

Great68

Founding Member

May 16, 2002

691

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16

Victoria BC

Nov 16, 2004

#4

• Nov 16, 2004

• #4

Currently I have Autolite 3924's in mine, I used to have what I think was the Accel Equivalent.

 

Hink

Member

May 31, 2006

67

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6

Jun 1, 2006

#5

• Jun 1, 2006

• #5

Hi, The Dan . One important thing I have found out about plugs lately is, when going from iron cylinder heads to aluminum ones. The length of the threaded part of the plug needs to be a fair amount longer ! Or you're plug won't correctly stick into the combustion chamber, this in effect retards your timing, not a good thing. This may lead you to overtiming the ignition, in an attempt to get the engine to run good . Hope this is relevant.
Sincerely ,
Hink

 

thehueypilot

Active Member

Feb 25, 2004

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62

Medina,Tennessee

Jun 1, 2006

#6

• Jun 1, 2006

• #6

I run NGK 7942 (R5672A-10) in my AFR 225's. (which is equivalent to Autolite 3922 which is one step colder than the 3924 mentioned above.)

 

2bav8

Founding Member

Nov 30, 1998

2,511

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47

59

Mesa, AZ

www.geocities.com

Jun 1, 2006

#7

• Jun 1, 2006

• #7

Very happy with my Auto-lite 3923s with my AFR heads.

 

HookandLadder

Founding Member

Feb 17, 2001

261

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17

St Louis

Jun 1, 2006

#8

• Jun 1, 2006

• #8

Accel 761's, but that is with a bit of nitrous.