Lower than I expected 10-12 Inches with a stock '68 4 speed 340 cam...15 inches max cruise. I tested for vacuum leaks, etc. Just for fun I'm going to check when the intake valve opens and compare to the cam card but I checked centerline and it installed it at 110.5 deg. which is 1.5 degrees advanced. I don't recall why I did that. It will give me a chance to pull the covers and have a look now that its broke in and has some miles on it.