.508/.508 298/294 at close 251 248 at 050" 106 lobe seperation
Here is it and where I got it
http://cgi.ebay.com/5-Solid-Cam-Kit-sb-Chevy-IMCA-Hobby-Stock-508-508-Lift_W0QQitemZ180103500490QQihZ008QQcategoryZ33614QQcmdZViewItem
10.25:1 I got this dizzy from a friend. I need to look over the spring and the advance mechanism. I am not using the vac advance. It is a MSD pro billet.