AC Delco platinum or NGK Iridium plugs
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Joined: Jul 2005
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AC Delco platinum or NGK Iridium plugs
I have been hearing alot about the Iridium plugs but I have a friend that is a gm tech and he sayd stay with the ac's till I go nitrous. How good are the NGK's as far as miles on them go.
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Joined: Jan 2005
Posts: 491
From: Lincoln, AL
Re: AC Delco platinum or NGK Iridium plugs
Welcome to the board! 
I recently made the decision on plugs. I ended up going with the non-Iridium NGK TR55s. I have read a lot of good things about them. I am about to go with LT headers when I change Plugs, wires plugs etc. The plugs were much less expensive than the AC's. They will not last as long, but will be easier to access after headers, and for the money can be changed a couple of times before they cost as much as the ACs.
About the NGK Iridiums... I have not heard anyhting good or bad about them yet.
I recently made the decision on plugs. I ended up going with the non-Iridium NGK TR55s. I have read a lot of good things about them. I am about to go with LT headers when I change Plugs, wires plugs etc. The plugs were much less expensive than the AC's. They will not last as long, but will be easier to access after headers, and for the money can be changed a couple of times before they cost as much as the ACs.
About the NGK Iridiums... I have not heard anyhting good or bad about them yet.
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Joined: Feb 2004
Posts: 406
From: Demotte,Indiana
Re: AC Delco platinum or NGK Iridium plugs
NGK TR6IX with my mods below they dramatically improved my gas mileage. As far as performance dunno. 6.99 a plug though 
Previous plugs were AC Delco, NGK TR55 and ACCEL with the best for me being above.
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Joined: Dec 1969
Posts: 165
From: Tallahassee, FL USA
Re: AC Delco platinum or NGK Iridium plugs
Unless Delco solved the problem with the platinum pucks falling off, I wouldn't take Delcos if they were free.
My '92 Corvette had Delco platinum plugs from the factory and 6 plugs had pucks fall off.
Tom Piper
My '92 Corvette had Delco platinum plugs from the factory and 6 plugs had pucks fall off.
Tom Piper
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Joined: Dec 2001
Posts: 1,519
From: High Orbit
Re: AC Delco platinum or NGK Iridium plugs
Originally Posted by Tom Piper
Unless Delco solved the problem with the platinum pucks falling off, I wouldn't take Delcos if they were free.
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Joined: Nov 2004
Posts: 1,374
From: Raleigh, NC
Re: AC Delco platinum or NGK Iridium plugs
The iridium plugs are supposed to last a ridiculus amount of time. If you have longtube headers, then they are a good idea, as you don't want to have to change plugs very often.
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Joined: Mar 2001
Posts: 2,667
From: SLC, UT
Re: AC Delco platinum or NGK Iridium plugs
Originally Posted by jerminator96
The iridium plugs are supposed to last a ridiculus amount of time. If you have longtube headers, then they are a good idea, as you don't want to have to change plugs very often.
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Joined: Mar 2001
Posts: 2,667
From: SLC, UT
Re: AC Delco platinum or NGK Iridium plugs
About every 5K or so, typically once or twice a season... Mobil 1 Synth & a K&N Filter...
You can get away with running those plugs longer, but I modify the plugs so they have a shorter life.
You can get away with running those plugs longer, but I modify the plugs so they have a shorter life.
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Joined: Apr 2005
Posts: 30
Re: AC Delco platinum or NGK Iridium plugs
autolite 104 is in the engine now i think im goin to change to 103's or ac delco r42lts i dunno yet
but i have around 11.3:1 cr so run a colder plug
the ngk tr6ix is a nice plug its one stage colder than stock
tr55ix is the stock heat range iridium plug
if you have some decent mods then run the tr6ix
but i have around 11.3:1 cr so run a colder plug
the ngk tr6ix is a nice plug its one stage colder than stock
tr55ix is the stock heat range iridium plug
if you have some decent mods then run the tr6ix
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