The M30 is prone to breaking rockers, even in bone stock form under normal driving conditions. Just ask us how we know! The stock M30 rockers, especially after many years of use fatigue and stap where the ecentric is located. This can sometimes be extremely harmful to an engine. It is a very good idea to replace your stock rockers with these heavy duty m30 rockers if, you have broken your rockers, plan on running aftermarket cams or plan on pushing the limits of your engine both through modificaions or driving style.
SOLD AS A SET OF 12 The rockers do not come with ecentrics. Simply transfer your stock ecentrics over to the new rockers and you are done!