Advance and Retard Cam Bushings 0 Degree Camshaft Degree Bushings An easy way to advance or retard your cam timing. These offset bushings come in packs of 5 (4 offset & one 0°). Precision manufactured to offer precise timing of your cam. Color coded. Requires drilling a 13/32” hole in camshaft timing gear. Advance and Retard Cam Bushings 0 Degree Camshaft Degree Bushings