I only have one snake-a ball python that's a bit over 1 year old. Your question gave me an excuse to use the Snake Measurer program again. I hadn't played with it for awhile!
Weight is 602 grams and length is ~83.1 cm. A mass to body length ratio of 7.2 g/cm
You might be interested in this post on a paper that compares various species' mass to body length ratio. As a Davidson Biology professor put it, "Sometimes research begins in the [scientific] literature, not the laboratory [or field]" (Campbell 2004).
I'd be interested in knowing the mass to body length ratio of other people's snakes, particularly ball pythons. I also wonder if this ratio varies with age, sex, etc. Also sometimes we worry that our guy is a bit too skinny.
Ref.
Campbell, A.M. (2004, May). Open Access: A PLoS for Education. PLoS Biology, 2 (5): 560-563.