According to a an article by J.Mummert in Y-Block Mag some years ago, the lobe lift on a 1957 EDB cam is .271" intake & .283" exhaust. Advertised duration was 256 deg.@ 18 deg.. At .050 lift, duration is 208/209 deg. Lobe seperation was 114 deg.  Lift & duration was the most of any Y-Block cam except for the F. code.. The only place that I know of that apparently has a correct pattern for an original '57 cam is Oregon Cams in Vancouver Washington. All regular replacement cams after 1958(?) are essentially truck grinds, another downer for the engines performance reputation.  Further, Mummert pointed out that due to manufacturers measureing difererences, advertised durations are often nearly useless information..  


Paul