Manifold OR Ported Vacuum Advance?? There is a case to be made and I side with David Vizard!

Thanks to subscriber Kevin Clemence for inspiring this video. Article by Steve Davis and David Vizard: https://nastyz28.com/threads/tech-art... David Vizard’s Ignition Video:    • Ignition timing tech you probably did not ...   DUI Performance Distributors. https://performancedistributors.com/