Round Back Alternator Rebuilder

Mattax said

The V belt lengths are sometimes sized by effective length, and other times outside length.

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Just was looking through my notes
Dayco part number for v-belts consists of nominal top width followed by effective length.
For example. 15480 is 15/32 wide, 48.0 inches effective length, 48.6" overal length.

For the later water pump and pulleys, a non-a/c, non-p/s LA engine Dayco lists a 15475.
Chrysler books show a belt listed as 47.76" O.S.

For the early LA water pump and pulleys Dayco lists the 15470 belt.
The shop manuals show the belt length as 46.50" O.S.