Iridium plug gapping

[Peaven]

Just picked up a set of TR55IX plugs....NGK has them gapped at .059 and says to leave them there...LT5 specs of course say .050, so....which one is right?:icon_scra

Anybody that has theses plugs got any insight....Uly?

Thanks for the help gang.:cheers:

[blackjack]

im sure the ngk big boss doesnt know what a zr-1 is....the gm service manual says .035...the wider the gap,the harder it is for the coil to fire the plug,to the point of misfire,specially the newer plugs with so-called precious metal,which is good for long life,buut not so good for conductivity...i gap my ngk at .040,no mo'
blackjack
91/1735

[guinnessdood]

Just picked up a set of TR55IX plugs....NGK has them gapped at .059 and says to leave them there...LT5 specs of course say .050, so....which one is right?:icon_scra

Anybody that has theses plugs got any insight....Uly?

Thanks for the help gang.:cheers:
I have the same plugs but cannot remember for the life of me the correct gap. Call Corey Henderson and he will tell you... 210-867-6286. If you are running the stock coils and the original or stock wires I would gap them at no more than .045. If you have better wires and/or coild you could go out to .055-.060....so my research tells me...

[Peaven]

Thanks guys:cheers: ....I think the 90-92 LT5's spec gap is .035 but the 93-95's get the gap spec'd at .050, no?

I'll either call Corey or Marc Haibeck tomorrow, thanks for the phone# Uly.