Yes, here's a graph from the first pull of the day.




Mine is a 5.3, as stated this is my 3rd season with these plugs.

 

I see that Dick and i am impressed. what I meant was those of us running the NGK tr6 and br7 plugs to toss in these plugs and see what happens. Or in your case swap to a NGK plug, do some pulls and what do you find?

Meth is a game changer for me. It changes the whole dynamic of the tune and plugs

 

i ordered some 41-104's last night, got to pick them up today. my tahoe has been running like poo on the 7's so i'll see if these help any. if you want a 7 heat range AC Delco iridium scroll up i put the part number up there.

 

At 14 psi, my 5.3 ran 11.62 & 11.63 at 113 mph. Never had that combo on a dyno, but the online calculators put it at 609 rwhp. Tim Z's truck (basically the same configuration/weight as mine) dyno'd at 627 rwhp with a nearly identical timeslip, so I believe the 609 is a realistic number.

I ran BR7EF NGK plugs. Platinums in my truck required a much less aggressive tune, thusly it made quite a bit less power.

BTW, if you decide to experiment with spark plugs, take the time to learn how to read spark plugs. You must cut the threads off the plug to properly read them. The spark plug is a very valuable tuning tool if you know how to read it. The spark plug will tell you what the engine wants, in regards to heat range, gap, and fueling. Wideband AFR is not the king, spark plug is the king.

 

Lol i stirred up a hornets nest here

 

Nah, just sharing my own experience on the topic.

 

Same here, I put them in when my boost and power levels were low and haven't tried anything else because I haven't seen a reason to. When I turn it up again maybe I'll need to try something different.