Which Spark Plug

289 · 01-13-2004, 12:10 PM

Right now I have bosch platnuim spark plugs in my 5.0, should I change them out I was reading that NGK is good which part number NGK's should I use

PWR_RYD93 · 01-13-2004, 02:31 PM

Platinum = long life (not high performance)

Copper core = high performance

The copper core NGK plugs have excellent quality. I don't know what part number plug for stock heads. I run Autolite copper core plugs. They have very good quality and they are inexpensive. I change plugs so often (several times per racing season) that I can't justify spending more than $1.18/plug.

Autolite part number 25 will work well with stock heads and no power adder. If you're supercharged or spraying nitrous oxide, step down a heat range or two (24's or 23's).

BLACK85GT · 01-13-2004, 08:24 PM

I always use autolite or motorcraft. I tried the bosch once (for a couple days), and it ran like crap. since then nothing but motorcraft.

Hozer 88GTConv · 01-14-2004, 08:36 PM

3924's...solid, even with a bad valve guide or seal they still fire strong.

01-13-2004, 12:10 PM	#1
289 Registered Member Join Date: Jan 2000 Location: Mount Joy, PA , U.S. Posts: 198	Which Spark Plug Right now I have bosch platnuim spark plugs in my 5.0, should I change them out I was reading that NGK is good which part number NGK's should I use

01-13-2004, 02:31 PM	#2
PWR_RYD93 Registered Member Join Date: Sep 1998 Location: IL Posts: 1,155	Platinum = long life (not high performance) Copper core = high performance The copper core NGK plugs have excellent quality. I don't know what part number plug for stock heads. I run Autolite copper core plugs. They have very good quality and they are inexpensive. I change plugs so often (several times per racing season) that I can't justify spending more than $1.18/plug. Autolite part number 25 will work well with stock heads and no power adder. If you're supercharged or spraying nitrous oxide, step down a heat range or two (24's or 23's). __________________ Craig Supercharged 93 GT "I drive way too fast to worry about cholesterol!" Then I went to the doctor.... whoa 312! Hello Lipitor

01-13-2004, 08:24 PM	#3
BLACK85GT Registered Member Join Date: May 2002 Location: Tampa,FLORIDA Posts: 340	I always use autolite or motorcraft. I tried the bosch once (for a couple days), and it ran like crap. since then nothing but motorcraft. __________________ 5.0, Holley heads, 1.7 Scorp Rockers, Stealth intake, Holley 600 carb, Holley Mech. Fuel pump, MSD 6Digital, MSD distributor, Hotchkis upper/lower rear control arms, FMS B Springs, 3:73 (8.8) rear. Production # 9,377

01-14-2004, 08:36 PM	#4
Hozer 88GTConv Registered Member Join Date: Feb 2002 Location: Jacksonville, FL Posts: 706	Autolite 3924's...solid, even with a bad valve guide or seal they still fire strong. __________________ 1988 GT Convertible 331 10:1 TW heads, GT-40 intake, MSD, TRW flattops, B Cam w/ 1.7's, MAC exhaust, 24's, 70 TB, 76 MAF, 3.73's, Pro 5.0, Koni's, Anderson PMS, Wideband 02, yatta, yatta... One week with new motor, two speeding tickets...joy

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