Prior to extensive research, it was thought that the pushrod only had to be strong enough not to fail, bend or burn up at the ends. But engineers have learned that the frequency of the pushrod must match that of all the rest of the parts in the valve train, as well as the rpm at which the engine will be run. As cam profiles get more aggressive and valve spring pressures increase, the importance of selecting the right pushrods has never been more critical. Speedmaster™ carries a wide selection of precision pushrods to handle any application from stock replacement to hardcore race.