dynoed my 416

Moper, you are so very correct with your explaination of the lost motion with the terrible valve train geometry the small Mopar is blessed with. With the lifter and pushrod not in plane with each other. These engines lose just about .010 of lift on the pushrod side of the rocker. Which adds up considering the multipication of the rocker arm. Yes that .550 lift cam is really only in the .530 range as installed. We cannot use the formula straight up like the Phord, Chevy folks do. Lobe lift multiplied by rocker ratio...just will not be accurate with our small Mopars. This really needs to be in the considerations when in the planning stages of our build ups. It has been my experience that with the small Mopars...the use of 1.6 rockers will give 'back' the lost lift. Using 1.6 rockers will give, at the valve, within a thousandth or two of what the cam is speced out to be with 1.5 rockers. Very good Moper...I was thinking I was the only one who saw this. Lead on buddy.

TB