Correct NGK Plugs for 550+Hp SB

[wrogers55]

Sorry Chas. No disrespect or ignoring of your post was intended at all.

Maybe this will unruffled your feathers a bit. You obviously have good information based on experience and I don't want to discourage you from providing it to others.

I sent an email to AFR, detailing the full motor build and use (one of your concerns), the problem, with pictures of the plugs. Their recommendation was the 3922s, with a host of reasons and comparison to other plugs, including slightly different version comparisons to your brand. These guys made the heads and provided the back up for their recommendations. The motor builder also recommended the 3922s, citing AFRs work independently. It all seemed like a good idea and reasonable starting place.

But really, I am also quite sure your suggestion worked well for you and probably would or will work well for me too. Seems the conditions are pretty close.

I had to do this in a hurry, in a small town without much in the way of resources and simply had to take what was available and get as close as possible. It didn't work well and that's my point. My post was to actually try to help someone else who might find themselves in the same boat someday. If you have to stray from experience or solid recommendations, be careful. Which is what I did. The motor is not in meltdown mode, it's pinging a bit on the low end. About 25 miles and it's parked waiting on the good stuff.

No insult or ignoring of your post was intended at all and I still thank you for your time and suggestions, which I may get back to before this is over!