Chevyboy203

I've had the bosh plus 4. Piece of crap burnt Chevy dealer pulled the plug when I had issues with the mass air Guy told me just buy the ac delco plug any plug better for the money of iridium

TX Tahoe Z71

iTrader: (28)

NGK TR55 gapped at .055". Replace every 20k miles.

Chevy_King1500

iTrader: (7)

+1 for a N/A engine

Choda

iTrader: (1)

^^^ I've read the same

1FastBrick

iTrader: (17)

Stock AC Delco's Gapped to .040

They will go 100,000 plus miles.

Suburbazine

The only problem with the Iridium plugs is that older engines will foul them unlike Copper plugs which don't suffer from oiling as much.

20SS06

I've tried everything on the market and I can safely say that the best plugs are always the stock ones.

brandon_6667

iTrader: (3)

I have ran the stock acdelco plugs in my 6.0 with both .055 and .040. I am currently running them at .040 when I changed the plugs and tried the .040 gap it seemed to run a little smoother but also kinda feels a little weaker, not sure if its just me or if I lost a little torque.

Summerwolf

iTrader: (3)

Coming from multiple lsx cars.... they love ngk plugs. Thats all I've ever really used.

Mangled03gmc

iTrader: (95)

STOCK plugs. 55's Still run them, with boost.