The concept of placing a small wheel at the end of a tappet to reduce friction has existed for decades, and in fact, roller camshaft setups have been available for the American V-8 engines we tinker ...

When Chet Herbert introduced roller tappet camshafts to racing in 1950, he established an upper echelon of performance hardware that continues to carry that hard-core mystique. The roller tappet ...

The delicate relationship between the tappet and pushrod in a V-8 engine has not advanced far in our lifetime. While other cam technologies have taken the spotlight when it comes to making the power, ...