So as an example if anyone fitted a Silvertop oil pump on the Blacktop engine then the Blacktop’s timing belt pulley would need being rotated half a tooth further more relative on the protrusion on the Silvertop oil pump. Pictured under would be the Blacktop pulley put on the top https://bookmarkspecial.com/story18668749/blacktop-4age-things-to-know-before-you-buy