What began as a design exercise has produced what we think is a big improvement in roller rockers! These are made of stainless steel, which allows for a much more compact design. Hence, there is less weight over the valve and pushrod, and because they're narrower they can be centered over the valve. An additional bonus is that they're made to clear the large diameter valve springs that many racers are using today. Fully assembled as shown, in high lift 1.5 ratio.