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NGK Spark plug gap to 13.5 compression BB #3232066 05/10/24 02:13 PM 05/10/24 02:13 PM
Joined: Dec 2012 Posts: 1,824 Wind Gap,Pa. S Sammy OP top fuel
Sammy OP top fuel S Joined: Dec 2012 Posts: 1,824 Wind Gap,Pa.	I'm running a ngk 5672A-8 #7173 sparkplug and need the gap size. Indy 440-1 aluminum heads.

Re: NGK Spark plug gap to 13.5 compression BB [Re: Sammy] #3232075 05/10/24 03:13 PM 05/10/24 03:13 PM
Joined: Jan 2003 Posts: 31,050 Oregon A AndyF I Win
AndyF I Win A Joined: Jan 2003 Posts: 31,050 Oregon	I don't mess with them, just take the plugs out of the box and run them. NGK plugs are usually gapped just fine right out of the box.

Re: NGK Spark plug gap to 13.5 compression BB [Re: Sammy] #3232077 05/10/24 03:54 PM 05/10/24 03:54 PM
Joined: Jan 2003 Posts: 5,486 SoCal Brian Hafliger master
Brian Hafliger master Joined: Jan 2003 Posts: 5,486 SoCal	Originally Posted by Sammy I'm running a ngk 5672A-8 #7173 sparkplug and need the gap size. Indy 440-1 aluminum heads. N.A. I would set them at .035 which OOTB is what they should be close to. Brian Hafliger

Re: NGK Spark plug gap to 13.5 compression BB [Re: Brian Hafliger] #3232089 05/10/24 05:32 PM 05/10/24 05:32 PM
Joined: Jan 2003 Posts: 10,011 Frostbitefalls MN (Rocky&Bullw... gregsdart I Live Here
gregsdart I Live Here Joined: Jan 2003 Posts: 10,011 Frostbitefalls MN (Rocky&Bullw...	Originally Posted by Brian Hafliger [quote=Sammy]I'm running a ngk 5672A-8 #7173 sparkplug and need the gap size. Indy 440-1 aluminum heads. N.A. I would set them at .035 which OOTB is what they should be close to. [/quote ]me too 8..603 156 mph best, 2905 lbs 549, indy 572-13, alky

Re: NGK Spark plug gap to 13.5 compression BB [Re: gregsdart] #3232097 05/10/24 07:16 PM 05/10/24 07:16 PM
Joined: Sep 2010 Posts: 350 Indiana Gabby63 enthusiast
Gabby63 enthusiast Joined: Sep 2010 Posts: 350 Indiana	That is what I use , .035 , -1 heads . Gary

Re: NGK Spark plug gap to 13.5 compression BB [Re: Sammy] #3232130 05/11/24 02:38 AM 05/11/24 02:38 AM
Joined: Aug 2003 Posts: 43,228 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,228 Bend,OR USA	It depends on which ignition and plug wires as far as how much gap I would use as well as how much compression ratio and fuel used Post yours please Last edited by Cab_Burge; 05/12/24 06:29 PM. Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: NGK Spark plug gap to 13.5 compression BB [Re: Cab_Burge] #3232348 05/12/24 04:24 PM 05/12/24 04:24 PM
Joined: Jan 2003 Posts: 10,011 Frostbitefalls MN (Rocky&Bullw... gregsdart I Live Here
gregsdart I Live Here Joined: Jan 2003 Posts: 10,011 Frostbitefalls MN (Rocky&Bullw...	Originally Posted by Cab_Burge It depends on which ignition and plug wires as far as how much gap I would use as well as how much compression ratio and fuel used Post ours please Good point. At 15.25/1 and methanol i run em tighter, .024 8..603 156 mph best, 2905 lbs 549, indy 572-13, alky

Re: NGK Spark plug gap to 13.5 compression BB [Re: gregsdart] #3232365 05/12/24 06:34 PM 05/12/24 06:34 PM
Joined: Aug 2003 Posts: 43,228 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,228 Bend,OR USA	The old testing standard use to be to open them up from .035 in .005 increments and keep opening it until it would start to miss or not pull hard in high gear in the 1/4 mile and then back it down to where it didn't miss I've ran the old Champion race plugs as far as .090 wide with an MSD 404B box and matching Mallory coil with solid core plug wires Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: NGK Spark plug gap to 13.5 compression BB [Re: Brian Hafliger] #3232463 05/13/24 08:50 AM 05/13/24 08:50 AM
Joined: Feb 2003 Posts: 2,563 S.E. Michigan cl440 master
cl440 master Joined: Feb 2003 Posts: 2,563 S.E. Michigan	We run the -7 plug gapped at .035 N/A running E85

Re: NGK Spark plug gap to 13.5 compression BB [Re: Sammy] #3232465 05/13/24 09:08 AM 05/13/24 09:08 AM
Joined: Jan 2003 Posts: 13,375 Marion, South Carolina [><] an8sec70cuda I Live Here
an8sec70cuda I Live Here Joined: Jan 2003 Posts: 13,375 Marion, South Carolina [><]	I ran R5671A-8 NGK plugs gapped .030"-.035" on a 14:1 compression Indy headed 440 w/ C12 fuel. CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax

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