Originally Posted by
velociabstract
Informative blurb, when I went from my Code 3 65 mm to a 178 and Needswings manifolds my AFR's went from 11.8 at redline to 13. If you don't retune, at least run 100 at the track. I ran at 13 to 13.5 at the 1/2 mile and for a few weeks WITH 100 octane with no ill results. Expect to be around 13 AFR.
Les
I was running high octane last night and do plan on a re-tune from EC, just wanted to see what the difference was between the 65 and 62, hopefully the re-tune and larger pump will keep it from being lean on the top