those with NGK TR55's
 

what are you gapping these at for N/A applications..???
I was curious..

and also has anyone ever had the top of the NGK come loose?

Daniel,

when I had the crew, I was gapping mine at .60 and yes. The tops came loose very often on mine.

I have mine gapped at .055 which is where they were at out of the box.

I run mine at .035

.055 and the little brass piece that the boot clips on yes it comes loose easily.

.055, and same as above. the ends come off very easy. And I've had three sets including a set of the iridiums

That was the problem with the truck lol the 03 and up have the spark plug gap at .40 from the factory

Daniel, just leave it at .55, and put some lock tight on the tip. just alittle.

do the ngk tr 55's perform better than the stock plugs? just wondering...

I didn't notice any difference in performance...

.55 at the moment. Never a problem.