What is the difference between high ratio roller rockers or ultra high ratio roller rockers (1.9:1 or 1.98:1) to suit Ecotec & L67?" Jason July 04, 2023 09:29 Updated The ultra high ratio rockers give more valve lift allowing the engine to breathe better. With the ultra high rockers you tend to see more high rpm gains than with our 1.9 high ratio rockers. Comments 0 comments Please sign in to leave a comment.
Comments
0 comments
Please sign in to leave a comment.