Spark plug gap

**ryanm086** · 04-29-2014

I have a 99 gtp with the following mods, 1.9 roller rockers ported and polished heads, ported and polished blower, 3.5 inch downpipe with cat delete, 3.1 undersize pulley, tune by ZZ performance for 93 octane with kr, its my first time changing the plugs with the mods, and I don't think stock would come gapped right any suggestions on how to tell what the gap should be?

**ryanm086** · 04-29-2014

http://shop.zzperformance.com/store/...ark-Plugs.aspx also these are the plugs I want to order but I've heard that you can't gap iridium plugs.

**REDCRAPGP** · 04-29-2014

Boosted loves copper plugs

And no you can't gap iridium

I vote Autolite 104s gapped at .50-55

**ryanm086** · 04-29-2014

Alright so its best to stay away from the iridium then?

**REDCRAPGP** · 04-29-2014

Iridiums are fine if you don't want to change them to often as opposed to copper where you'll be changing them every 2-3 oil changes.

**ryanm086** · 04-29-2014

So then, the iridium plugs come ready to run since you can't gap them?

**Speedy1973** · 04-29-2014

Originally Posted by REDCOMPG

I vote Autolite 104s gapped at .50-55

x2

Mine are gapped at .60

**ryanm086** · 04-29-2014

Do you have similar mods?

Sent from my SCH-I500 using Tapatalk 2

**dsmuts** · 04-29-2014

why not gap iridium? I do it all the time

**ryanm086** · 04-29-2014

Would you mind explaining your procedure to gap iridium plugs?

Sent from my SCH-I500 using Tapatalk 2

**dsmuts** · 04-29-2014

I use a spark plug gapper and gap them to specs

**ryanm086** · 04-29-2014

Ok, so just the same as regular, not trying to insult you, just thought there might be something special you had to do, either plug I choose the general consensus seems to be to run around a .50 gap for my setup right?

Sent from my SCH-I500 using Tapatalk 2