I wouldn't do that, that's a HOTER plug then what's in there. They don't understand the FI motors need cooler plugs so they don't detonate. Everyone I have ever talked to says the TR6 at .35 are the way to go for these motors and FI. I'm running the equivalent in a Denzo, because the parts store didn't have the NGK the day I needed them. No problems for me

 

I installed TR6's at .035 and it runs MUCH better.

The wide band is still not working and I don't know why the passenger bank runs so much more rich. Looks like I need to contact one of our sponsors in the Chicago area for an exam, repair and tune session. There goes a thousand or so.

It might be cheaper/smarter to just scrap the Dynojet WB and get the dual sensor FAST digital. Of couse I'd still need the tune up on a Dyno.

 

I was thinking about this some more today.
Fouled plugs can be just the result and not the problem.
The oxygen sensor could be the problem, or a very bad exhaust leak in that bank somewhere upstream of the O2 sensor, or it could be a bad injector that's dumping fuel.
With as much soot in the exhaust as you've described, that O2 sensor is toast anyway.

 

Thanks for your attention James... I appreciate the input.

I switched the O2 sensor to a spare I had so we'll see if that changes anything. There was soot on the ground in back of the truck after running it for only about 30 seconds.

I discovered that the intake manifold/sc was only bolted down finger tight on all the bolts on the right side (thank you Zippy and helper) so maybe air was getting past the manifold and changing the reading & calling for more fuel? But a leak at that point in the fueling process would leak fuel onto the engine (right?) and that hasn't been the case.

All four plugs were fouled so the injector idea probably doesn't pan out.

It has to be something that would affect only one entire bank... but only one bank... as the drivers side plugs were very clean while all the right side plugs were totally black/sooty.

Does the puter read the banks individually and adjust fueling individually?

How does the fuel supply get seperated and regulated into left/right side fuel rails? I know where the fuel line attaches to the pressure regulator but I can't visualize what happens next. What apparatus regulates and seperates the supply to the individual fuel rails? Could the left side be starving, the puter sees an average then adds fuel so then the right side is then over-fueled in order to get the left side adequately fueled? I'm lost at this point... don't know enough to visualize what happens at this point in the fueling process.

Obviously I don't know much so any education provided will be appreciated.

 

After I put headers on mine I fought a battle with the passenger side O2 getting lazy and going bad. I originally had the narrow band O2 guage hooked up to it. 3 sensors failed in 1 week with the narrow band gauge hooked up. After I unhooked the narrow band gauge I still had issues with the pass side (b2 S1) being a little more lazy and my pass side plugs showing more rich. I never tried corvette O2's to see if this would solve the problem I have just opted for full speed density tuning and turned off the O2's and MAF sensor.