Can someone suggest what they have seen to be the best A/F for the engine to build the most HP NA? I used to run 12.2 to 12.5 in my big blocks in the olden days. I think someone here would surely "know". Opinions please? I am tuning and I do not have a butt dyno within any reasonable distance to me. I will get a dyno tune eventually, but for now I want to know opinions on this.

Thanks,
Russ

 

My car is right around 12.8 at peak and that's what Brenspeed recommends, for what its worth. They said they don't recommend going higher than that.