Spark plugs for 350 what are you using and why?

Here you go.....Looks like more than 1/2 of the strap is getting hot. Probably can go one heat range less. This is with 77/90 jetting.

 

Take a pic looking straight down the top of "J" strap

 

Here Mr. Analyzer.

 

Should be a line about halfway back when you hit the right heat range. looks like maybe the line goes over the curve on the "J" strap?

www.dragstuff.com/techarticles/how-to-read-plugs.html


They look warm on yours
I put my plug in there to show how mine looks like. I use NGK works for the nitrous .

 

Looks like a little sootiness on your plugs on the outside ring Mart, Maybe the plug is too hot since it is a extended tip style so go down 1 number and take a little bit of jet out then. Some of the plugs look pretty white on the insulator. The line on the "J" strap is getting ready to go around so it may be a little hot plus you are giving it more gas. Maybe take a degree out of timing to be safe. Looks like it anyways your interpretation may differ.

almost spring