Hey, I'm the new guy on the block. I would appreciate any pros or cons on using Nology hot wires with silver spark plugs on a 2003 LS1. Nology recommends the plug gap to be the same as origanal plugs which in the LS1 is .060. To get a .060 gap on Nologys silver plugs the ground electrode must be bent at an angle whereas the electrodes are not parallel. I contacted Nology and their response was to gap the plugs at .043. With the .043 gap the electrodes look better as being parallel. My concern is the closer gap going to hinder the performance gained.

My first thought was that yes I think it would affect the performance, but that is also only my opinion, there must be other ways to remedy this issue.

I copied this for you, it's an answer from a well respected C5 mechanic on this very issue. Hope it helps...

What I will say to you will not be popular, however, the following is FACT.

I do NOT suggest aftermarket plugs in any way. There are many reasons, however, I will share the basics with you. The biggest reason is ignition timing.
Theory follows.
If you look at the spark plug center electrode, it projects a certain amount from the base of the threads. That is called electrode protrusion. What alot of people do NOT understand is that there were 3 different plug designs on c5. And each one had a different electrode protrusion. 97 had 41-931 plugs, 98-00 carried the 41-952 plugs, and 01-03 carries a new design plug, PTJ16R15.
As you can see, differences abound, that people do NOT like to talk about.
Now, the reason that the electrode protrusion has such a bearing on ignition timing is that the protrusion is the starting point of the flame front, as it burns the fuel across the combustions chamber. This changes the amount of time that the fuel takes to burn. HOWEVER, HERE IS THE REASON THAT IT’S SO IMPORTANT.
The engine control computer does NOT know that the plugs were changed, and the timing program is for the original plugs that were in there. So, it will advance or retard the timing, based on the original equipment spark plugs. This timing program may NOT be ideal for power production with the different plugs. And obviously, there are differences in the spark plugs, you will have a different running engine when you change the plugs. Some aftermarket plugs do not protrude as far into the combustion chamber, so this actually retards ignition timing, because the flame has farther to travel across the chamber. This is the reason that so many people report no engine detonation when they change plugs, when they heard the detonation before.

It seems we have more variables to worry about then just gap size! From my research the NGK TR55s DO work great as a plug replacement all variables considered, although there is no noticable gains over the AC Delco Iridiums... Just my .02! :)

Very good information,...Thanks.