Long before there were emissions concerns, just power and economy, and mechanics were expected to figure it out. "But I set the timing just last week." This link will download an MP4 file to play. centrifugal advance spring tech not universal. The difference, and relationship between "distributor" degrees and rpm and "crankshaft" degrees and rpm is kind of glossed over. ported vs unported 8:45
The Jalopy Journal
