Spark plug mystery

[ARV90SC]

I’ve had a miss/hesitation at WOT, and have been reading it could be anything from the DIS to the wires, or plugs. A friend said with too much boost at WOT the spark could be getting blown out. So I decided to swap the plugs, and I pulled out these fully threaded NGK plugs. Compare to new autolites going in. Gap was well over 0.050. Anyone know if maybe my new plugs are wrong or the old ones were? I’m assuming the autolites will also stay out of the comb chamber probably better to protect the spark from blow
Out?

 

[89SupercoupeSC]

Autolites are the original design but the fully threaded ones will go in just as deep.
Here is a comparison picture i took because I was wondering about it, denso iridium (fully threaded) and original spark plugs:

 

[DOUG H]

Well, seeing that both valves are closed during the compression stroke & remain closed after the spark occurs, cant see how the amount of boost in the intake system can "blow it out"

 

[David Neibert]

Gap the new plugs from .035 to .040 and they will be fine. The .050 plug gap on old plugs is too much.
Seat to electrode strap distance is about the same so the threads won't matter. Are the new plugs Autolite 104 ?

 

[351tt]

Well, seeing that both valves are closed during the compression stroke & remain closed after the spark occurs, cant see how the amount of boost in the intake system can "blow it out"

Maybe he was thinking cylinder [ boosted ] pressure, the higher the cylinder pressure and or plug gap the harder it is for the spark to jump .. " blow it out " is a term used for years but really from my experience its always meant spark can not jump the plug gap.

 

[DOUG H]

You are probably right, sounds like his biggest issue is the gap is too wide & those plugs look like they've got a lot of miles on them too. Fresh properly gapped plugs may cure his issue.