Go here for info
http://www.classracerinfo.com/Default.aspx
Stock Classes HP Factor: 385 Power/Weight Factor: 8.74
# index
Lightened Class A/S - 8.00 Lb/HP 3250 10.95
Natural Class B/S - 8.50 Lb/HP 3443 11.20
Weighted Class C/S - 9.00 Lb/HP 3635 11.35
Manual Transmission Classification
Bob
PS:
Thanks to Dwight this info is easily available...