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Maybe some of you know, but I just found out that the AC Delco plugs for the 3500 engine are actually NGK plugs made in Japan.
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2000 Grand Am GT
2011 Chevy Impala
"The world's best cam combined with a poor set of heads will produce an engine that's a dog. But bolt on a set of great heads even with a poor cam, and that engine will still make great power." ~John Lingenfelter -
these are the iridium ones right.sigpic
99 Grand Am GT
3400/3500 -Solid trans mount--TCE 65mm T-body---85mm LS2 maf---1 1/4' TCE intake spacers with 3400 upper--SLP Catback with flowmaster 80--TOG headers
Modded 3400 lifters with LT1 springs---Comp Cams 26986 Springs
1357 cam 227 233 .050 dur 515 515 lift 112 lsa
15.232@88.85mph on stock 3400---New time to come
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I am not sure that they are the iridium plugs, they are just the stock 3500 plugs that GM uses. I think they might still be classified at the platinum plugs.2000 Grand Am GT
2011 Chevy Impala
"The world's best cam combined with a poor set of heads will produce an engine that's a dog. But bolt on a set of great heads even with a poor cam, and that engine will still make great power." ~John LingenfelterComment
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pretty sure they are iridium. ive got them in my motor now.sigpic
99 Grand Am GT
3400/3500 -Solid trans mount--TCE 65mm T-body---85mm LS2 maf---1 1/4' TCE intake spacers with 3400 upper--SLP Catback with flowmaster 80--TOG headers
Modded 3400 lifters with LT1 springs---Comp Cams 26986 Springs
1357 cam 227 233 .050 dur 515 515 lift 112 lsa
15.232@88.85mph on stock 3400---New time to come
Comment
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Iridiums have a small gauge electrode tip usually unshrouded. NGK makes all standards of plugs not exclusive to iridiums. Platinums have a longer ceramic shroud surrounding the electrode tip.
Not news to me that NGK is branded under Ac Delco so is Delphi, weatherpac, metra pac, and tons of other dual branded parts. NGK also contacts out work orders under partnership and also grants rights to use the plug seat if marked NGK under trandmark copyrights.
Oh well linky to WWW pics not working.
I am sure that most stock replacments are platinum after 2000, I can not tell form your picture if the one shown is platinum as you don't show the electrode.
A 3500 engine list a AC delco Platinum plug as OEM equipment.Last edited by Juglenaut; 02-11-2007, 01:29 AM.I am back
Mechanical/Service TechnicanComment
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05 3400 and 04 3500 use the same plugs, ITR4A, which when searched come up as NGK Iridium plugs.
I have a set in my car and another set in the basement since I recently aquired a 05 3400 and a 04 3500... Plus I have some autolite Iridiums in the car waiting to go in to see if that solves my "misfires" that my DHP logs...
Got Lope?
3500 Build, Comp XFI Cam 218/230 .050 dur .570/.568 lift 113LSA
Fully Balanced, Ported, 3 Angle Valve Job, 65mm TCE TB, S&S Headers.
Stage-1 Raybestos/Alto 4t60e-HD, EP LSD, 3.69FDR
12.61@105 Epping NH Oct 2015 Nitrous 100shot (melted plugs) 13.58@98.8 N/A 3200LBSComment
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my '03 3400 that i picked up today has ACDelco/NGK iridium plugs in it1994 Chevy Corsica. Parted out. Just a rotting shell now
Best 1/4mile ET - 12.9
Best 1/4mile MPH - 111
1997 Ford Ranger Splash
Daily DriverComment
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