If you guys have access to LRP plugs, i would be using them IMO. I have tried most other plugs and find myself back on the LRP plugs every time! I have three Go 5P one with a Massive Mods Stage 5, one stock and one with a Turbo head, I run #6 plugs in the non turbo and 6T and 7T LRP plugs in the turbos.

I also am just about to run in a GO 28 6+2 pro motor and 28 pullstart motor for my savage. If they go anything like the the 21 5P they should be a very powerful mill!!!