Today’s engines, like a 6.2-liter Hemi, have computer-controlled management systems that accurately maintain the fuel trim and ignition timing to guarantee near perfect operation of the engine at all times. While a modern engine is maintained at a razor-sharp tune, how could we improve the performance of a “good ol’ days” rudimentary mechanical and vacuum-advance controlled distributor coupled with a carburetor? To research how much ignition timing influences engine performance, we visited Pennsylvania College of Technology (Penn College) to use their 225 Slant-6 equipped 1967 “dyno Dart” on a Mustang chassis dyno.

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