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#1
07-15-2009, 01:17 AM
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Denso/NGK Iridum Pugs - Your opinion and/or experience?
Hi All,
I presently have two running LT1s with iridium plugs. One is a 1995 Impala SS with an LT1 383 and it has Denso iridium plugs. The other is a 1996 Z28 LT1 with NGK iridium plugs. I have been told by a few people that these iridim plugs will not last long in a Chevy small-block because they are designed for the small four cylinders. What are your experiences? I'm personally leaning towards AC-Delco double platinums. 
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#2
07-15-2009, 05:12 AM
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Re: Denso/NGK Iridum Pugs - Your opinion and/or experience?
The Impala group swears by the Ac DElco Iridiums!!! They say the engine only likes these. Others will need to be changed much more often.
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#3
07-16-2009, 03:21 PM
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Re: Denso/NGK Iridum Pugs - Your opinion and/or experience?
Thanks.
But what is the prefered material for engine ours? Double platinum or iridum?
__________________
The Few, The Fast, The F-Bodies... //^\\ 1996 Chevy Camaro Z28 "The Silverhawk"  //^\\ 1995 Chevy Impala SS "The Flying Fortress"  //^\\ 1977 Chevy Truck "Redneck Mobile"  //^\\ 1984 Chevy Camaro Z28 - Presently a project  //^\\
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#4
07-16-2009, 10:42 PM
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Re: Denso/NGK Iridum Pugs - Your opinion and/or experience?
Well, I like iridium due to the long life. A few bucks more though.
__________________
02 Impala LS Too many classic Rivieras to list!! 
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#5
07-17-2009, 12:10 PM
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Re: Denso/NGK Iridum Pugs - Your opinion and/or experience?
I understand that the iridiums last longer, which is good thing considering what a pain it is to change sparkplugs on fbodies.
However, what I'd like to know is if anyone has noticed a significant difference in milegae and/or performance between the iridiums and the platinums. Anybody who religiously tracks their gas mileage or knows of dyno tests? 
__________________
The Few, The Fast, The F-Bodies... //^\\ 1996 Chevy Camaro Z28 "The Silverhawk" //^\\ 1995 Chevy Impala SS "The Flying Fortress" //^\\ 1977 Chevy Truck "Redneck Mobile" //^\\ 1984 Chevy Camaro Z28 - Presently a project //^\\
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#6
07-18-2009, 07:24 PM
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Re: Denso/NGK Iridum Pugs - Your opinion and/or experience?
I couldn't answer that. But one more thing. Use great care while checking the gap. You could ruin thetip very easily.
__________________
02 Impala LS Too many classic Rivieras to list!!
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#7
07-21-2009, 02:06 PM
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Re: Denso/NGK Iridum Pugs - Your opinion and/or experience?
Yeah I've never messed with the gapping on them because of how fine the tips are. Plus they come pre-gapped.
I pulled on of the Denso iridum plugs out to check the other day and it seems to holding up fine.
__________________
The Few, The Fast, The F-Bodies... //^\\ 1996 Chevy Camaro Z28 "The Silverhawk" //^\\ 1995 Chevy Impala SS "The Flying Fortress" //^\\ 1977 Chevy Truck "Redneck Mobile" //^\\ 1984 Chevy Camaro Z28 - Presently a project //^\\
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