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platnium spitfire spark plugs

titanfan12

titanfan12

New member
are these plugs good to use on a 3.4 pulley? ive ran these ever since i got the car. Just curious if these are the right kind for the job. i cant find the heat range for them online so i wanted some other peoples opinons
 


Everyone pretty much sticks to copper core plugs. Autolites are real popular and have good heat range choices.
 
4) Spark Plugs - Change out those stock spark plugs with new ones to restore any lost power. Brands that most tend to go with are either Copper Core Autolites or NGK's. They range as follows in order from hottest to coldest plugs...remember...you want the hottest spark you can get away with...so running a super cold plug on a larger pulley to combat knock isn't the best plan...OEM replacement ACDelco's, AL606's, and AL605's are basically for stock cars or very small bolt-ons still running the stock S/C Pulley or modded N/A guys...you want to keep a hot spark. NGKTR55/AL104's for your 3.4" Setup, TR6's are a tad cooler...best used around the 3.25" pulley area, and AL103's...are for the extreme supercharged application...3.0" pulley or lower. Here is a picture to reference the firing order and the correct coil number if yours aren't numbered or you just need a quick reference picture: http://i33.photobucket.com/albums/d6.../plugwires.jpg

AC Delco Factory Replacements: Stock
Autolite 606: Stock
Autolite 605: 1 Heat Range Cooler
NGK TR55: 1 Heat Range Cooler
Autolite 104: 2 Heat Ranges Cooler
NGK TR6: 2 Heat Ranges Cooler
Autolite 103: 3 Heat Ranges Cooler
 


Iridiums or Copper cores. Stay away from E3's and any platinum plug. Most boosted cars eat platinum plugs, stick with the ALs or NGK/ACDelcos.
 
these plugs have been on for quite some time, and there still going good but i will probably switch when i need new ones
 
Platinum plugs were made for extended plug life, it's less conductive than copper and generally are hotter plugs, don't be fooled by marketing. Best to stick to copper and not be as lazy with car maintenance.... If you really want a longer lasting plug then iridium might be ok to use.
 
Over time the waste spark ignition system will eat the plugs and give you issues.

Like said run some coppers on a modded car. I'd go with 605's on a simple 3.4 setup.
 
sco77 said:
Platinum plugs were made for extended plug life, it's less conductive than copper and generally are hotter plugs, don't be fooled by marketing. Best to stick to copper and not be as lazy with car maintenance.... If you really want a longer lasting plug then iridium might be ok to use.
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In other ignition systems, yes. But for the GM waste-spark systems Platinums are a no-no as they WILL get eaten up rather quickly and cause misfires, often seen as soon as 6K miles on new plugs. Misfires under boost are an issue as they can lead to chipped pistons and then a new motor. These cars come with Irridiums from the factory, and coppers will work best on the 3.4 setup but require them to be changed more often but as usual you gotta pay to play.
 


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