How the Modern Racing Pushrod was Invented » DR-1101-Trend-06
A curious conundrum occurred when race engine builders began experimenting with new lubricating oils in their quest for more horsepower: They succeeded in reducing frictional losses and gaining power, but as a consequence the oil lost some of its vital lubricating qualities, and the health of some internal engine parts suffered, notably the rocker balls. To combat this deficiency, Trend introduced pushrods that contained bronze inserts. These immediately overcame the problem.
