Injector type (N65 vs. N70) cannot be determined from ESN alone; requires injector tube stamp.
| Location Type | Description | Common Series | |---------------|-------------|----------------| | | Aluminum or mylar tag, typically riveted to the rocker cover, valve cover, or side of the cylinder block. | All Series (2-cycle & 4-cycle) | | Block Stamping | Directly stamped characters on a flat machined pad, usually near the fuel pump or oil cooler. | Series 53, 71, 92, 149 | detroit diesel engine serial number search
Two characters + hyphen + 5 digits → typical of 1970s–80s Series 71. Injector type (N65 vs
