Which Sparkplugs for GT40P's?

Shotgun28 · 01-27-2001, 02:22 PM

What spark plugs do I need for my GT40 P heads with and without Nitrous. I am more concerned about without at this point, until spring. I prefer Autolites, just trying to figure out what size. Thank you.

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91 LX Convertible Gray on Red B&M Shift improver kit,ASP red alum. underdrive pulleys, Richmond 3.73 gears, 1 5/8 Flowtech long tube Headers and off road h-pipe, Flowmaster 2-chamber cat-back with S.S exhaust, MSD 6A Ignition with coil,Cap and rotor, Taylor Pro wires, K&N 12" conical filter system, Jet stage 2 performance chip and just purchased some GT40P heads, looking at exhaust, Lentech Street Terminator plus on it's way...

Shotgun28 · 01-27-2001, 03:03 PM

I talked to the guy I bought the new heads from and he works at a place called Victory Engines , and he said that I should ask for 93 Cobra plugs, does this sound right, just making sure.I am sure he knows what he is talking about, just trying to comfirm before I buy.

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91 LX Convertible Gray on Red B&M Shift improver kit,ASP red alum. underdrive pulleys, Richmond 3.73 gears, 1 5/8 Flowtech long tube Headers and off road h-pipe, Flowmaster 2-chamber cat-back with S.S exhaust, MSD 6A Ignition with coil,Cap and rotor, Taylor Pro wires, K&N 12" conical filter system, Jet stage 2 performance chip and just purchased some GT40P heads, looking at exhaust, Lentech Street Terminator plus on it's way...

93SVTstang · 01-27-2001, 08:13 PM

Hey Shotgun28, I just put new plugs in my Cobra and the receipt said they were Autolite 764 plugs. I don't know how they are with nitrous because I don't run it, but I hope this helps. Beau

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93 Cobra: MAC fenderwell mount cold air, BBK underdrive pulleys, 8mm plug wires, shorty headers, off road h-pipe, Borla Cat-back, centerforce clutch, hurst shifter, 3.55s, and 12* of timing

Jeff Chambers · 01-28-2001, 08:57 AM

Autolite 764, 103, 104's or Motorcraft AWSF32C, 22C, 42C. I've got a little comparison chart on my website under the Tech Tips section.

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Jeff Chambers
Trophy Stock #3
11.97 Seconds / 114.5 MPH
Chambers Racing Team

Shotgun28 · 01-28-2001, 12:29 PM

Jeff,

What should I gap them to? The autolite 764's. Same as stock? Is it the same plugs as a 93 Cobra like Bill Klein said? THanks gang for your help.

Kevin

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91 LX Convertible Gray on Red B&M Shift improver kit,ASP red alum. underdrive pulleys, Richmond 3.73 gears, 1 5/8 Flowtech long tube Headers and off road h-pipe, Flowmaster 2-chamber cat-back with S.S exhaust, MSD 6A Ignition with coil,Cap and rotor, Taylor Pro wires, K&N 12" conical filter system, Jet stage 2 performance chip and just purchased some GT40P heads, looking at exhaust, Lentech Street Terminator plus on it's way...

1989GT · 01-29-2001, 12:14 AM

Yeah does anyone know what plug to run with nitrous? Thanks!

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89GT,T-5Z, D.S.S. 306 shortblock w\main support, B-303 cam, Cobra intake, GT40P heads, 1.72rr, MAC "P" headers, MAC off-road H-Pipe, MAC true-fit w\tips, 373's...and the list goes on!
Throttle Junkie Powered by Ford!
12.824 @ 107.05 MPH
PVT Blankenship leaving for BCT 14MAR01
MOS 67 Romeo

Jeff Chambers · 01-29-2001, 07:25 AM

Can't help with the NOS gap, but for N/A I'd start out around the stock setting of 0.050-0.054". If you've bumped the compression and have an aftermarket ignition box, then you can start working it down some. I've run mine as low as 0.035" but tend to gap them around 0.045" most of the time.

------------------
Jeff Chambers
Trophy Stock #3
11.97 Seconds / 114.5 MPH
Chambers Racing Team

Josh91 · 01-29-2001, 11:03 AM

I just went to Advance Auto and got Autolites for a 98 Explorer 5.0. I have mine gapped at .050. I do have raised comp, but have stock ignition for now, so that is why I gapped them so high.

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1991 Mustang GT - Cobra Intake, FMS 65mm TB, C&L 73mm MAF, GT-40P heads, Crane 2031 cam, Crane 1.7rr, Built AOD, Art Carr 2400 non-lockup converter, Transgo shift kit, BBK chrome cold air, FMS 'P' headers, Pacesetter off-road H, BBK aluminum pulleys, 2-C Flows w/ dumps, 4.10's, Steeda STB, for now...

The Original GT-40P Tech Page

01-27-2001, 02:22 PM	#1
Shotgun28 Registered Member Join Date: Sep 2000 Location: New Hope MN USA Posts: 276	Which Sparkplugs for GT40P's? What spark plugs do I need for my GT40 P heads with and without Nitrous. I am more concerned about without at this point, until spring. I prefer Autolites, just trying to figure out what size. Thank you. ------------------ 91 LX Convertible Gray on Red B&M Shift improver kit,ASP red alum. underdrive pulleys, Richmond 3.73 gears, 1 5/8 Flowtech long tube Headers and off road h-pipe, Flowmaster 2-chamber cat-back with S.S exhaust, MSD 6A Ignition with coil,Cap and rotor, Taylor Pro wires, K&N 12" conical filter system, Jet stage 2 performance chip and just purchased some GT40P heads, looking at exhaust, Lentech Street Terminator plus on it's way...

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01-27-2001, 03:03 PM	#2
Shotgun28 Registered Member Join Date: Sep 2000 Location: New Hope MN USA Posts: 276	I talked to the guy I bought the new heads from and he works at a place called Victory Engines , and he said that I should ask for 93 Cobra plugs, does this sound right, just making sure.I am sure he knows what he is talking about, just trying to comfirm before I buy. ------------------ 91 LX Convertible Gray on Red B&M Shift improver kit,ASP red alum. underdrive pulleys, Richmond 3.73 gears, 1 5/8 Flowtech long tube Headers and off road h-pipe, Flowmaster 2-chamber cat-back with S.S exhaust, MSD 6A Ignition with coil,Cap and rotor, Taylor Pro wires, K&N 12" conical filter system, Jet stage 2 performance chip and just purchased some GT40P heads, looking at exhaust, Lentech Street Terminator plus on it's way...

01-27-2001, 08:13 PM	#3
93SVTstang Registered Member Join Date: Dec 2000 Location: Metairie, LA, United States Posts: 80	Hey Shotgun28, I just put new plugs in my Cobra and the receipt said they were Autolite 764 plugs. I don't know how they are with nitrous because I don't run it, but I hope this helps. Beau ------------------ 93 Cobra: MAC fenderwell mount cold air, BBK underdrive pulleys, 8mm plug wires, shorty headers, off road h-pipe, Borla Cat-back, centerforce clutch, hurst shifter, 3.55s, and 12* of timing

01-28-2001, 08:57 AM	#4
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Autolite 764, 103, 104's or Motorcraft AWSF32C, 22C, 42C. I've got a little comparison chart on my website under the Tech Tips section. ------------------ Jeff Chambers Trophy Stock #3 11.97 Seconds / 114.5 MPH Chambers Racing Team

01-28-2001, 12:29 PM	#5
Shotgun28 Registered Member Join Date: Sep 2000 Location: New Hope MN USA Posts: 276	Jeff, What should I gap them to? The autolite 764's. Same as stock? Is it the same plugs as a 93 Cobra like Bill Klein said? THanks gang for your help. Kevin ------------------ 91 LX Convertible Gray on Red B&M Shift improver kit,ASP red alum. underdrive pulleys, Richmond 3.73 gears, 1 5/8 Flowtech long tube Headers and off road h-pipe, Flowmaster 2-chamber cat-back with S.S exhaust, MSD 6A Ignition with coil,Cap and rotor, Taylor Pro wires, K&N 12" conical filter system, Jet stage 2 performance chip and just purchased some GT40P heads, looking at exhaust, Lentech Street Terminator plus on it's way...

01-29-2001, 12:14 AM	#6
1989GT Registered Member Join Date: Apr 1999 Location: Cincinnati,OH Posts: 1,511	Yeah does anyone know what plug to run with nitrous? Thanks! ------------------ 89GT,T-5Z, D.S.S. 306 shortblock w\main support, B-303 cam, Cobra intake, GT40P heads, 1.72rr, MAC "P" headers, MAC off-road H-Pipe, MAC true-fit w\tips, 373's...and the list goes on! Throttle Junkie Powered by Ford! 12.824 @ 107.05 MPH PVT Blankenship leaving for BCT 14MAR01 MOS 67 Romeo

01-29-2001, 07:25 AM	#7
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Can't help with the NOS gap, but for N/A I'd start out around the stock setting of 0.050-0.054". If you've bumped the compression and have an aftermarket ignition box, then you can start working it down some. I've run mine as low as 0.035" but tend to gap them around 0.045" most of the time. ------------------ Jeff Chambers Trophy Stock #3 11.97 Seconds / 114.5 MPH Chambers Racing Team

01-29-2001, 11:03 AM	#8
Josh91 Registered Member Join Date: Nov 1998 Location: Salina, KS Posts: 83	I just went to Advance Auto and got Autolites for a 98 Explorer 5.0. I have mine gapped at .050. I do have raised comp, but have stock ignition for now, so that is why I gapped them so high. ------------------ 1991 Mustang GT - Cobra Intake, FMS 65mm TB, C&L 73mm MAF, GT-40P heads, Crane 2031 cam, Crane 1.7rr, Built AOD, Art Carr 2400 non-lockup converter, Transgo shift kit, BBK chrome cold air, FMS 'P' headers, Pacesetter off-road H, BBK aluminum pulleys, 2-C Flows w/ dumps, 4.10's, Steeda STB, for now... The Original GT-40P Tech Page