Used to always run TR-55s gapped at .050" on my stock internalled 95z28. Now i need to know what plugs i should run on my new car.

383 LTx 11:1 CR
LE2 heads

All other mods are in sig but i think these are the only two relevant ones. For the time being, this motor will be N/A.

So, what plugs would you guys recommend? TR6s? Autolites? Also what gap? Thanks guys

 

no one here is running an LE2 setup or similar?

 

The TR55's at the same .050 gap should be fine. I have some milled LE2 heads on a 350 with about the same compression, maybe a tad more and run the TR55-IX iridiums with .050 gap just fine. YOu would start using a tighter gap when you get into a boosted or NOS application.

 

GM changed their recommendation concerning the gaps from the .050-.060 to .040-.044 on the V8s (around 2003). So depending on the application you'd probably be looking at a TR51X (irradium) witch is already gapped at .040 (however always best to check). If you are other than NA you may be using a different plug, gapl, etc. Or if you have a powerful ignition you might change the gap too.

I don't know why they would go from .050 to .040, however I have an MSD anyway, so my .050 gaps are probably where they should be. JMHOl

 

i heard maybe an autolite 104 would be good?

 

An autolite 104 is just a standard copper plug.. bad news bears, imo. Spend the extra on the TR55-IXs, you won't regret it.