<VV> identifying high volume heater motor

[John McMahon]

The heater motor on my 1965 Monza has a plastic fan installed, which made me 
start wondering if the motor itself is stock or not.  Is there an easy way 
to identify a high volume motor?  Mine says "Delco Products, Dayton OH", and 
it *looks* like the stock item.  It does NOT look like the high volume motor 
in the Clark's catalogue, but I don't know whether or not that's what they 
all look like.

Many thanks in advance,

John McMahon
1965 Monza coupe