So how do you........

[Uncle Mike]

... ... ID a Cummins? I don't mean the ISB we have in the truck, but rather the Cummins engine in other applications. For example; in a 1985 GMC General I've seen has a Cummins engine. How can a guy look at it and say it's an 855? Or how about the class 8 rig at the local truck stop. How do you tell a L10 from an M11, from an N14? I'm looking for a way to easily ID one from another. Any hints?

 

[SEmerson]

there is a tag on the timing cover