It looks like the
848 and 913 was first used in 1953,
Passenger, P.G., Hyd. cam.

In 1954, the 913 or 848 was then used on Passenger, Hyd. or Mec., up through 1962.

Trucks also used the 913 starting in 1954.
In 1955 - 62 trucks used the 913 or 848.


-Tom

1950 Chevy 3100 w/ 1956 235