I still run that cam in my 340. Got nothing bad to say about it. I run about 18 degrees of inital timing and it has great manners for the street.Sounds great at idle. Have no idea about milage. I drove my 340 all over the west this past summer with that cam including to the top of Pikes Peak and in the desert heat of Reno Nv. Car ran great everywhere. I've had this same cam now in three different motors, it's out lasted the motors.