I had to use the Barry Grant website and input some numbers.
http://www.barrygrant.com/demon/imag...tity-Speed.pdf
I have a 6 cast into the top of the body and also the "downleg boosters" which comes out to the 650, VS on the side for vacuum secondary. There wasn't a part number on it anywhere else I could see. I spent some time a while back researching this and am pretty confident in my findings.
FOREVER71, let me know if you are still interested. Is USPO o.k. for shipping?