I used to run a total of 40 degrees on my 406. It used to run on the fat side though. The best run came at 40. I had a 10.25 300hp 350 that used to always ping especially on the burnout. I just put some octane booster(the cheap stuff) and problem went away.
A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more!