Mornin, Everybody. Doing some experimenting, so I put a "509" cam in my 440. It is 292 duration, 108 degree int lobe center, 248 dur. @ .050, .509" adv lift. So the 77-440 with 8 to 1 compression actually (rough) idles fairly well. Maybe because I installed it with 4 degrees advance at crankshaft. 2