Read my plugs?

[JohnDougherty]

I cut up a couple of plugs from a few weeks ago.
Small block, no power adder on 100 octane Sunoco.
The plug on the left is a 3923 and the right is a 3924.
The 3923's had about 25 passes and the 3924 was in
for one night.
The 3924's seem to be a little faster.

[John_Heard]

John, looks ok for the most part on the right plug. I'd sugguest at this point start jetting it for MPH, it might still be a tad fat.

[julven]

So JohnD what is your best time now? Jason

[JohnDougherty]

Thanks for the reply John.

So far Ive run 11.73 @ 115.5 with a 1.62 60 foot time.
The density altitude changes from 1200 feet down to 300 as the night goes on. I took the front down one jet size since I pulled the plugs . The bigger jet might be right in a few weeks from now when the DA goes under sea level conditions.
Im also taking the 3200 stall speed out and putting in a (hopefully) 4500. Right now when I leave the car jumps out and kinda sits there til 4000 and then takes off.

[BSeery]

how do you take the threads off so cleanly ???

[JohnDougherty]

I use a cut off tool and chuck the plug up in a lathe.

[BSeery]

I use a cut off tool and chuck the plug up in a lathe.

must be nice to have a lathe to do that. Very easy to read the plugs in that manner.

I would agree, it looks like you could pull a little fuel out to be ideal. It's close and looks like it would be a manner of tuning for speed and changing weather conditions.

[John_Heard]

You can cut them reasonably well with a chop saw or a cut off wheel in a die grinder also.

[DriveWFO]

At what point do you want to tune the air bleeds instead of jetting?

[dadnova]

Looks like your heading in the right direction. If you still have the ends look at the ground bar and see where the blue ring or heating ring is. It should be at the bend close to where its welded to the plug. If its at the flat point you should go a little hotter.