340 cam specs?

All the same- vendor changes and maybe computer smoothed Remember Crane bought one of the Big Detroit grinders (and where are they now?)
All ground by a big Detroit grinder no mater who you get it from
nice reminder of the Blue Racer line and excellent catalog
note the 268-276 number is just an identifier for the factor replacement- it has no basis in reality but is close to .008 so compare with Racer Brown or Engle or others that use .008
.the SAE .004 posted above gives you a hint on how long the ramps are (especially on the close)
I consider this cam to be wholly obsolete for ANY BUILD
what started out as a performance cam for a high compression motor with excellent wear-ability and low warranty claims- (I was there as a service mgr then) morphed into a smog cam for low compression motors