RJM Clutch Pedal System for 370Z - Fully Customizable Clutch Feel & Stroke

Originally Posted by Ryan @ RJM

JARblue, you can independently move the height of the lower arm section up/down up to 3/4" by loosening the 3 bolt connection between the upper/lower arms allowing the arm to be "clocked" to a new angle and then tighten it back up again. Although the adjustment you mentioned above with the 2 bearing pre-load bolts is specifically just for aligning the clutch rod for a straight push of the linkage and not intended for height adjustment beyond leveling the rod.
Hope that helps a bit but I suspect what you're trying to do is raise the entire assembly more on the firewall which can't be done.