R Pope I agree that this cam would make the 283 'rough'.Seems to me that this cam would suit a street 400 motor alot better to produce the torque it was designed for. But I can't understand why some think that the cam may be too much for the smaller bore but higher reving 283??? If the 283 has good high rpm potential with low speed sacrificed somewhat,,,wouldn't a cam like this thats designed to produce good low RPM power give the 283 good power where it needs it most,at lower RPM's without hurting high RPM power?