Originally Posted by BusyBenz

Detroit engines are sized this way: 8 is for the number of cylinders, 91 is for cubic inches per cylinder. While I'm not familiar with an 891, there were 892's with turbo, also there were 871's as well earlier on.

Correct me if I'm wrong as I don't know all the configurations of these Detroit engines, the Detroit line up also included 453, 471, 492 I think, also were 653, 671, 692 V-six turbo, as well as a non-turbo 871, and turbo 892, and then there are the V-12's 1271, 1292, and I think 16 cylinder engines as well. What's interesting is that the pistons from a 471 will fit all 71 cube engines as many parts are interchangeable.