WHAT DOES 4AGE 20V MEAN?

So as an example if someone equipped a Silvertop oil pump on a Blacktop engine then the Blacktop’s timing belt pulley would need to be rotated fifty percent a tooth further relative for the protrusion to the Silvertop oil pump. Pictured below is the Blacktop pulley placed on the top with the Silvertop pulley and in a position where their interior