A crank trigger distributor assembly and method for sealing the crankcase from leaking vacuum through the distributor installation hole. A crank trigger distributor assembly and method for minimizing and/or preventing crankcase leakage, while being adjustable and adaptable to engine blocks or intake manifolds of various manufacturers. A crank trigger having a distributor stem, a collar located on the distributor stem, and at least one sealing element, the at least one sealing element incorporated within the collar. A crank trigger distributor assembly and method for adjusting rotor tip phasing without touching the distributor hold-down, as the cap itself can be adjusted.