My motors are Covingtons rated at 850HP originally equipped with 9215 injectors and a specified 1.496" timing height. At some point, a PO installed M15's. Someone penciled in a timing height of 1.508" in my book. I do not know who or when or if that value was for the original injectors or the M15's.

While setting the valves, I noted a couple of the injectors were timed at about 1.495". I've got 1.484, 1.496 and 1.508 gauges on hand.

The motors run fine. Once I get back to the boat this week, I'll likely just make sure they're all the same. What are you other 12V71tic owners using as a timing value if you're running M15 injectors?