For rockers, we opted to step up to a 1.6:1 ratio, for brutally quick valve action with our Comp Cams roller cam. Stamped stockers (top) were non-adjustable, and plain out of their league in this type of application. The Comp Aluminum rockers (below) feature a 1.6:1 ratio, a roller tip, and needle bearing fulcrums. Get the complete kit, since the shafts and spacers are special. Unlike flat tappets, roller lifters (bottom right) are joined in pairs with a link bar, which holds the rollers in line with the lobe. Factory pushrods were out. We ordered a Comp adjustable checking pushrod (middle, left) to determine the required length.