LOLzorz... zing!

Haha, let me get this straight:
I should change what we've been using successfully for over a decade based on a YouTube video made by people I don't know and who cite data from a spark plug manufacturer I've never heard of in my 20+ years in the industry?

Uh, no!

Thank you Speedy.
I just realized that I've missed the probably most important information: I have Nology Hotwires (red wires) AND Permatune ignition plus W3DP0.

I bought the car like this with all above newly installed and car run flawlessly 14,000 miles so far.

Am I due for new spark plugs now and should I still use W3DP0 ?

Thank you,
John

My setup was once similar to yours (Andial intercooler, 3.3L, 7.0, Mallory Hi Fire) and I concluded that the W3DPO was the way to go. I also had good service life with them.

I have a unused set of W3DP0. Cant use them with EFI.

How long do they last? In other words, how often you'd recommend their replacement, based on time or mileage?

been using w4cs for the last 100k or so miles (street) and they seem to work fine, good color. Never checked head temp so other than just looking at color, engine sound and feel that's really all i have to go on...

They will go 40K to 60k, depending on driving cycle. The lower range is city driving. The higher range is city plus highway. I changed mine at 60k, as the idle was a little rough.

It's know sparks will blow out... at least mine did...
look at this video from msd showing that brisk spark plugs are more powerful... maybe an overkill for our cars but still... https://www.youtube.com/watch?v=SnsUAqC3ON0