N20 Spark Plugs

[coralcoupe1993]

What plugs would you run when spraying? How cold? They are going into a trick flow head.

[gmkillr]

1 heat range colder than stock will do the trick, but gap them down to anywhere from .028"-.035". I'd also use copper plugs, no platinum's or anything like that.

[J-rod]

autolite 23 is what tim reccomended to me.

[Viper_ed]

I'd use the Autolite 23's for the 100 shot you plan to run.

[juice_man_86]

Autolite 23's will work with most heads, but if you have GT40's or something like that, they will not work. Autolite uses the last 2 digits of the spark plug number to determine heat range, so just find out which plug a "stock" application would require, then go 1 to 2 heat ranges colder. Then reduce the gap to about .033-.034, you can go to abou .038 with a full MSD ignition (i.e. 6al, coil, ditributor optional)

[J-rod]

he is using trick flow heads

[Rodeheaver's]

how much of a hit and what compresson do you have, this is how to find the heat range you need, you cant just go 1 step colder than stock, what if you are hittin it with a 300hp shot, that would need some real cold plugs and it would prob need side gapped plugs...