Pet Peaves in Mechanic's Lingo

daredevil said
I was told it was due to duration. If it had 270 duration at .o5o is was a 3/4 cam

270 @ .050 would be about 350 advertised and wouldn't run. Early cams weren't measured @ .050. 270 could be considered 3/4 race and 300 duration would be considered full race. That's just the way it was back then. tmm