It is a lot of trouble to remove the valve covers and intake on a Hemi with power brakes, so when I did, I checked the valve lash while waiting for parts. With the intake off, you can clearly see when you are on the "heel" of the cam vs. starting up or down a ramp. Don't let ANYONE fool you, follow the exhaust open/Intake open, start to close procedure! In fact, be careful to adjust EXACTLY at those points or your lash will not show true! This is the product that all my racing friends recommend and use to seal the gaskets. Why and how did they discover it? I don't know. All I do know is they refuse to use any other product! (Universally, they are embarased to use an "import" product but universally recommend it!