These are a billet aluminum piece that will bolt in place of the stock Command coils with a machined pointer on them. The customer will have to find TDC and mark the flywheel to line up the pointer. We do not machine timing marks on anything we make. With the difference in castings and machining methods the absolute best way to time an engine is to use an adjustable timing light. That way you know exactly what your timing is not relying on somebody else’s marks.