Level with the hole when it's warm, 1/2" below when cold. Your
pinky finger should just be able to touch it cold when you hook
the first joint over the edge.
http://chevy.oldcarmanualproject.com/shop/1948_51truck/51ctsm0005.htm
After a refill, check it a few times after you run it till the
level stabilizes.
Denny G


Denny G
Sandwich, IL