There are angular alignment reference details to the timing belt program in the shape of a small protrusion on the oil pump along with the matching notch cut out of the timing belt push pulley’s rear flange. For no explicable rationale the timing marks / notch to the Blacktop engines https://4age-20v08110.blogoscience.com/38406263/the-smart-trick-of-toyota-4age-for-sale-that-no-one-is-discussing