MED 998 ROLLER ROCKER SET [MED-2131-RR998]

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MED roller-tip rockers give far more consistent valve lift across the head than the standard rockers, with an enlarged rocker shaft and adjusters for extra strength. Cylindrically- ground rollers in the arm tips reduce side-loading of the valve stems to improve valve and guide longevity, while also reducing friction. A host of unique design features equate to the highest quality 1.3:1 roller-tip rockers on the market. They're trusted by leading engine builders worldwide for all performance A-Series, mild road to full race. Design features: Uprated 17mm diameter rocker shaft for greater surface contact between the shaft and rocker arms. CNC-machined heavy-duty 7075 aluminium rocker arms for extremely precise valve lift across the head. High quality steel rocker posts, chemically black coated. Enlarged 3/8-inch UNF rocker adjusters with lightweight aerospace 'K' lock nuts. 3/16-inch hex socket adjustment in place of the regular flat-blade screwdriver slot. Fully assembled with alloy rocker spacers, end washers and split pins. Additional Information Benefits of the MED roller-tip rockers Standard rockers rarely give consistent valve lift across the head, even when new. After many years of use and wear, lift is likely to be even more inconsistent, so while 1.28:1 is generally given as the standard rocker ratio, a quick check of the valve lift will usually show otherwise. Optimising every aspect of the engine will enhance performance, and the 1.3 rockers should give marginally more lift than standard. Roller tips reduce side loading of the valve stems, in turn reducing friction whilst also improving valve and guide longevity. Add to this extra stiffness across the shaft, trouble-free tappet adjustment from enlarged adjusters, and you have an excellent performance upgrade. 1.3:1 vs 1.5:1 rockers All MED fast road and race camshafts are optimised to work best with 1.5:1 rockers, however we always prefer to run 1.3:1 rockers on smaller capacity engines such as 998 or 1098. These engines all seem to respond best with 1.3 rockers. Show more