o.k. im at the point where i realy want to push my stock bottom end and im prepared for the consequenses. so here is the set up: 11.4 comp, tr7 plugs gapped at .035, 112 in standalone, and 104 in main tank. i plan on running an af of 11.5. currently i run 28 NA. also, my elevation is 4k. this will be going through dave's plate.

 

I would start at 18 degrees and go from there, maybe even start with a colder plug. Since your running good fuel all around, you might be able to get up to 22 degrees. But, I wouldnt do that unless your really looking to push the limits.

Personally, i would rather have a sellable stock bottom end to cover some of the costs of a new one.

 

19* here tried it on pump gas once and the #7 plug didnt like it too much. now i usually run 50/50 93/104 in the tank, no standalone, no problems here.