allen syncrograph / 37 ford

[Bruce Lancaster]

Properly engaged slot locks the Distributor cam to a particular position in relation to engine cam, but does not set timing as such because the point plate is movable. If point plate is at middle mark it is probably pretty close to correct, if it is elsewhere in the slot timing is also elsewhere...timing needs to be set to get a baseline, from there once you know where you are tune away, each engine is entitled to its own preference.