What plugs do I need for nos

[Willy B Monte408]

I was told that I need to run a colder spark plug with my nos.I have a 355 with Brodix head hunter aluminum heads. And I'm going to start out spraying 100 shot to see how it does then move up to 150.

 

[FirstClass 383]

i use nkg-55 for mine, with a 100 shot, going to a step colder when i change mine over to 150

 

[Willy B Monte408]

i use nkg-55 for mine, with a 100 shot, going to a step colder when i change mine over to 150

Thanks man it seems to take awhile for someone to respond on here what is your timing set at this is my first nos kit

 

[soloone87]

this info will be helpful to me also, i have a 383 set up on 100 shot it should be around 550ish on motor and with 100shot timing has to be perfect as im pushing the performance gm block to the limit as it is

 

[Bar50]

I would advise you guys to follow the guidelines set forth by the perspective companies your systems came from. Most of the time it is 2 to 4 degrees per 50 horsepower.

For plugs, look for a non-projected tip plug. If you have a dual plane intake and a plate system, pull all the plugs after the first hit. See which ones show to be leaner than the rest, they will be your guide. I have had luck with normal AC Delco plugs, as I would rather the plug give up suffer a failure looking for aditional power, plugs are cheap.

 

[don4life]

ac delco 43rt

 

[Buzzkill]

4 degrees per 50hp? How about 2. That is recommended for a "safe" tune and you should READ YOUR PLUGS to see where to go from there. I have -8 NGK plugs on a 175 shot and its all good. BTW NGK plugs are the easiest to read.