340 Cam

The early 68 4 speed 340's had a bigger cam. The 340 automatic specs were 268,276 .429,.444

For the manual cam they put the auto exhaust lobe on the intake and borrowed the 440 magnum exhaust lobe for the exhaust to end up with 276,284 .444, .453. Both auto and manual cams had 114 degrees lobe separation.