Don't know if this helps or not, but after putting in the TR6s for the nitrous, I ran my first high 11 NA. Could have been better weather that day, but if it was, it wasn't by much as I usually ask around to find out what the DA is.

 

Would I be able to tell the difference if I tried two or three different sets of plugs? I supposed I could run one for a little bit (how long do you guys think?) then pull them and see how they look? If use their condition to tell if I am close to where I need to be starting with the Platinum Autolite 104's at 0.050" or similar.

 

dunno if this will help, but i have a 10.8:1 383 LT1 and im running Autolite Double Platinum 104's (part # APP104)....seem to work great for me!! and no unusually quick erosion of the electrode

 

Bump.
Someone tell me what plug and gap to run with my setup.
11.2 SCR, NA and never gonna spray. Rest of the stuff is in the sig.

 

you will probably need to mess with and and see what works. Try to learn how to read plugs from someone who ACTUALLY knows how.

I would start with an Autolite 104 gapped at approx .035"-.040"

EDIT: When i first got my motor together, I went through god knows how many sets of plugs to see what worked. I ended up with a tr-55 at .040"

 

Best bang for the buck,NGK's 55.Just gotta change em more often.Gap at 50.---35 if blown or nitrous.(only from previous posts.)Hey,if you've got the bread,do a dyno on both plugs.My02.