Hi Lift Roller Rockers 1.5 Ratio – WP25035 1.5:1 Hi Lift Roller Rockers. A 1.5:1 billet roller tip rocker assembly is an upgraded version of the standard A series rocker gear. The ratio (1.5:1) determines how much valve lift you get relative to cam lift. This ratio is higher than stock, making it a noticeable performance enhancement. Benefits include: Reduced friction at the valve tip thanks to the roller wheel. More consistent valve lift across cylinders, improving breathing efficiency. Less side loading on valve stems, which helps extend guide life. Smoother, quieter valvetrain operation due to improved geometry and materials. A significant increase in vale lift Direct bolt on upgrade for most A series heads after checking for coil binding Made in the UK and a massive improvement over the original Motaclan part CAM289 SKU: WP25035 Category: Go