Best NA Spark Plugs

acidtonic · March 12th, 2009, 04:52 PM

I'm in the mid 60K mileage range on my 97 Cobra and getting some surging above 5000rpm.

I first seafoamed the car through EGR to clean the dry ports, then ran some through the injectors and got the oil changed.....

My guess is plugs since they are stock. Next case being coils....

So I'm going to replace the plugs and I'm curious what to use for best NA Power? I've heard copper but they dont last as long. I can live with that if they are truly worth it. Also I changed plugs on my 98GT but heard about the 4v alum heads having issues with warping and such if replaced on a warm motor?

If I left the car parked for a few hours would I have any issues changing them? Just dont wanna ruin my heads. My guess is that it doesnt matter and I'm just worrying for nothing.

So, what plugs should I get without needing to finance them

What gap should I go with? Eventually planning to run 94 octane tune.

SWEET2KSTANG · March 12th, 2009, 07:01 PM

suppose to change them on any aluminum head when motor is cool, 2v's included. the coppers do fine and will last a while as well, platinums come stock. as far as brand, thats mostly personal preference. the iridium plugs about the the best you can get, but you may need financing for them

maybe try them enerpulse plugs from the vendor on here.

ReverendDexter · March 12th, 2009, 11:09 PM

NGKs or GTFO.

I'd go with plats, as that's what's stock. Remember that these are aluminum heads, so you NEED to put a dab of antisieze on each plug or electrolysis will destroy the threads in the head.

Doc8224 · March 12th, 2009, 11:10 PM

NGK tr55's they will last along time and are good n/a plugs

DSGMach1 · March 12th, 2009, 11:39 PM

Agree. I am running NGK TR55IX's (regular TR55's work good too) n/a and TR6's for spray.

tweeters97 · March 15th, 2009, 12:26 AM

i also have a 97 cobra. i read in mm&ff mag back 2 years ago they replaced the plugs with the denso iridium it16s on an early 4v cobra engine. i bought a set for my car and the idle is now smoother than with the platinums. due to change them soon. they've been in for over 18 months. no problems. good lick with financing, these puppies run $12 a plug.

NeverEnuff · March 15th, 2009, 02:20 AM

Autolite coppers.

My engine shop uses them in thier 3500hp ProMod.

They work and they are cheap.

acidtonic · March 15th, 2009, 03:55 AM

Put the TR55s in there. #7 appeared fouled but the other plugs all looked great. Still had the stock plugs too so thats not bad at 67K.

Appears to have fixed my surging issue and I even skimped and reused the plugs with some dielectric grease. Also applied anti-seize as suggested and so far my long drive tonight was great. Car feels much more peppy as well and feels even smoother.

I did notice though when removing the intake for passenger side plugs that the throttle body had a small amount of blackish oily looking residue. Cleaned that all up but I'm unsure how it got there.

I have to say it was 20x easier than changing plugs on my 98 non pi. 7&8 are accessible on the B heads! What a surprise. Even had my hinged extensions ready for getting in tight spots all set out for nothing.

All in all I'm happy. Thanks for the help guys.

ReverendDexter · March 15th, 2009, 05:25 PM

Originally Posted by acidtonic

I have to say it was 20x easier than changing plugs on my 98 non pi. 7&8 are accessible on the B heads! What a surprise. Even had my hinged extensions ready for getting in tight spots all set out for nothing.

Heh, yeah, DOHC is win for chaning plugs... so easy to get to!

97mustanggt · March 16th, 2009, 03:17 AM

i hear that the mustangs love copper plugs..

March 12th, 2009, 04:52 PM	#1
acidtonic Hardcore Enthusiast 97 Cobra Join Date: May 2008 Location: Royal Oak Michigan Posts: 1,059 iTrader: 0 reviews	Best NA Spark Plugs I'm in the mid 60K mileage range on my 97 Cobra and getting some surging above 5000rpm. I first seafoamed the car through EGR to clean the dry ports, then ran some through the injectors and got the oil changed..... My guess is plugs since they are stock. Next case being coils.... So I'm going to replace the plugs and I'm curious what to use for best NA Power? I've heard copper but they dont last as long. I can live with that if they are truly worth it. Also I changed plugs on my 98GT but heard about the 4v alum heads having issues with warping and such if replaced on a warm motor? If I left the car parked for a few hours would I have any issues changing them? Just dont wanna ruin my heads. My guess is that it doesnt matter and I'm just worrying for nothing. So, what plugs should I get without needing to finance them What gap should I go with? Eventually planning to run 94 octane tune. __________________ Converted to the Dark Side. 06 Apex Silver Evolution IX GSR - Turboback Exhaust, Tune - Wideband O2, Trustz backlight gauges, Apexi turbo timer - Stock wing, but soon to be wingless. - Guessing 280-310 at the wheels. 02 Red Escape V6 4x4

March 12th, 2009, 07:01 PM	#2
SWEET2KSTANG mm's nitrous mod 2000 mustang gt 11.79@115.83 (old set up) Join Date: Oct 2006 Location: N.W. AR Posts: 12,430 iTrader: 8 reviews	suppose to change them on any aluminum head when motor is cool, 2v's included. the coppers do fine and will last a while as well, platinums come stock. as far as brand, thats mostly personal preference. the iridium plugs about the the best you can get, but you may need financing for them maybe try them enerpulse plugs from the vendor on here. __________________ project warhorse under construction being built by MP2 Performance

March 12th, 2009, 11:09 PM	#3
ReverendDexter Priest of the Car Gods Clapped-out '90 GT 'vert ~5.5 seconds off TTOD :( Join Date: Jan 2007 Location: Rohnert Park, CA Posts: 13,233 iTrader: 0 reviews	NGKs or GTFO. I'd go with plats, as that's what's stock. Remember that these are aluminum heads, so you NEED to put a dab of antisieze on each plug or electrolysis will destroy the threads in the head. __________________ O o /¯/______________________ \|BLAAAAAAAAAAAAAAAAAAAAAAAAARGH!!! \_\ Buy my Bronco, special deal for MM folks

March 12th, 2009, 11:10 PM	#4
Doc8224 N/A 4v Guru 2003 Mach 1 Join Date: Oct 2007 Location: Afghanistan Posts: 3,463 Blog Entries: 2 iTrader: 1 reviews	NGK tr55's they will last along time and are good n/a plugs __________________ Military Crew U.S. Army Aviation Apache's Lead The Way

March 15th, 2009, 12:26 AM	#6
tweeters97 Regular 1997 Cobra 13.62@104 Join Date: May 2007 Location: atlanta Posts: 144 iTrader: 0 reviews	i also have a 97 cobra. i read in mm&ff mag back 2 years ago they replaced the plugs with the denso iridium it16s on an early 4v cobra engine. i bought a set for my car and the idle is now smoother than with the platinums. due to change them soon. they've been in for over 18 months. no problems. good lick with financing, these puppies run $12 a plug. __________________ MM Cobra Club #29 Who are you?????? Choose your destiny!!!!!!

March 12th, 2009, 11:39 PM	#5
DSGMach1 Newbie 2003 Mustang Mach 1 13.52@102 Join Date: Nov 2008 Location: Griffin, GA Posts: 23 iTrader: 0 reviews	Agree. I am running NGK TR55IX's (regular TR55's work good too) n/a and TR6's for spray.

March 15th, 2009, 02:20 AM	#7
NeverEnuff Hardcore Enthusiast 1989 LX Coupe 7.1@99mph Join Date: Jan 2009 Location: Texas Posts: 1,151 iTrader: 0 reviews	Autolite coppers. My engine shop uses them in thier 3500hp ProMod. They work and they are cheap.

March 15th, 2009, 03:55 AM	#8
acidtonic Hardcore Enthusiast 97 Cobra Join Date: May 2008 Location: Royal Oak Michigan Posts: 1,059 iTrader: 0 reviews	Put the TR55s in there. #7 appeared fouled but the other plugs all looked great. Still had the stock plugs too so thats not bad at 67K. Appears to have fixed my surging issue and I even skimped and reused the plugs with some dielectric grease. Also applied anti-seize as suggested and so far my long drive tonight was great. Car feels much more peppy as well and feels even smoother. I did notice though when removing the intake for passenger side plugs that the throttle body had a small amount of blackish oily looking residue. Cleaned that all up but I'm unsure how it got there. I have to say it was 20x easier than changing plugs on my 98 non pi. 7&8 are accessible on the B heads! What a surprise. Even had my hinged extensions ready for getting in tight spots all set out for nothing. All in all I'm happy. Thanks for the help guys. __________________ Converted to the Dark Side. 06 Apex Silver Evolution IX GSR - Turboback Exhaust, Tune - Wideband O2, Trustz backlight gauges, Apexi turbo timer - Stock wing, but soon to be wingless. - Guessing 280-310 at the wheels. 02 Red Escape V6 4x4

March 16th, 2009, 03:17 AM	#10
97mustanggt Hardcore Enthusiast 97GT & 97Snake & 00L T.B.A Join Date: Aug 2008 Location: Richgrove, Ca Posts: 2,196 iTrader: 0 reviews	i hear that the mustangs love copper plugs.. __________________ 97 Cobra & 00 Lightning Beauty & The Beast I rev next to hybrids so they can hear me kill the environment MM Cobra Club Member #77 MM Lightning Club Founder

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