Has anybody tired these spark plugs. i read an article in chevy high performance about them. they seemed to be the best on the market right now.

 

got em in my truck

 

454 Which ones are you running ?
it 20 or 22's?

 

My truck came stock with Denso Platinums.
Jim

 

i was talking about the denso iridium plugs. iridium is 6 times harder and 8 times stronger than platinum. so these plugs probably arent cheap.

 

no, there not cheap at all! my set of 8 cost around $90 but were well worth it. they last a very long time and smoothed out the idle a pretty good bit. i'm runnin' the IT16's (one step colder than stock) cause of the whipple.

 

I read a dyno review on these in Super Chevy magazine. After switching from regular plugs to iridium, a 300hp 350 motor made 8hp on average increase. pretty good for some damn plugs, but I guess if you got an effecient motor, and good ignition, that will help on top.

 

Hey 454SuperSport I thought the IT16 Denso plugs are the stock heat range. I thought that IT20's or IT22's are colder than stock.

 

NGK is making iridiums now for stock heat range and they are much cheaper than the Densos I believe the part number is TR55IX

 

thats cool. do you know where you could get them? should orieleys have them?