So a few members have tried manifold vacuum advance.

Found an improvement in idle quality, tip in and mileage and the rest of you insist on telling us it will not work according to instructions from 40 years ago.

At light load, partial throttle. Mild engines will happily motor along at 40-50 deg of timing.

If it takes 9" to pull a typical cannister open. Who cares if the vacuum is fluctuating between 12-22. The can will not move.


69 Super Bee, 93 Mustang LX, 04 Allure Super